CAD/CAM technology can significantly simplify this process. When a patient has a cavity, the dentist can remove the decayed portion and scan the remaining tooth with a 3D scanner. The scanned data is then transferred to a computer, where it digitally designs a replacement tooth. It's even possible to utilize AI for optimizing the design. The final design is then sent to a milling machine, which manufactures the artificial tooth. This streamlined process not only accelerates the procedure but also ensures consistent quality, eliminating issues arising from variations in knowledge or skill.

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Understanding focal length in photography can feel a bit overwhelming when trying to account for all of the ways it changes the properties of an image. Below, I’ve outlined the focal length differences across the major fields of view.

South Korea currently faces a unique demographic situation. On top of becoming the world’s first country to see its fertility rate fall below 1.0, experts estimate that by 2025, more than 25% of the South Korean population will be over the age of 65, turning the nation into one of the first super-aging societies in the world. This trend holds significant implications for the medical industry. While this demographic challenge may appear daunting, it also presents a distinctive opportunity for the Korean medical and pharmaceutical sector. What challenges and opportunities does Korea's unprecedented demographic scenario offer to medical companies?

Furthermore, dental treatments encompass not only addressing cavities but also aesthetic treatments. Preferences for tooth style and color vary from one country to another. In Korea, many patients opt for dental implants because they are covered by medical insurance. Thus, it's vital to develop efficient machines for performing implant treatments. However, in the United States, where the geography is vast, dental clinics and dental laboratories are often quite far apart. To address this challenge, systems have been developed to transmit dental images digitally between these locations instead of physically transporting dental impressions.

Hello Dan! I’m Mariam from Mauritius. I wanted to thank you for this deep explanation on focal length! I just bought my first camera and your article helped me so much!

A prime lens can’t be adjusted and its focal length and field of view are fixed. The trade-off for flexibility in focal length is usually a wider aperture and better image quality because the prime lens can be optimized for its angle of view. Usually but not always; some top-quality zoom lenses nowadays are absolutely comparable to prime lenses in terms of quality for a given focal length.

To begin, our corporate motto is "together we innovate." In the medical device manufacturing sector, I believe that it's the desires and needs of practitioners and doctors that drive the market forward, often more so than technological innovation. Therefore, our approach is to develop our products by incorporating the feedback and opinions of our clients, the doctors. If we continue to adhere to this strategy, I am confident that we can establish ourselves as a global leader in the market. In fact, we are already integrating a wealth of client input into our product development process. From the consumer's perspective, when their voices are heard, it enhances the credibility of our products.

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Focal distance is the distance between the subject you are focusing to the camera sensor. Lenses that can work at close focal distances have higher magnification (or reproduction ratios) relative to lenses that need you to stay far from the subject.

When you look at the focal length of the lens in question and you see a number below 35mm, you know you’re looking at a short focal length.

Focal length differences are especially stark with wide-angle lenses. Each mm of width makes a visible difference, unlike telephoto lenses where it takes several mm to be easily noticeable.

Moreover, my background is in engineering, not dentistry. I have transplanted our company's technology into the field of dentistry. With our 3D technology, we have plans to extend our reach into other industries as well. For instance, we are interested in combining robots with 3D scanners for applications in the manufacturing industry. I hope that a decade from now, DOF Inc. will have evolved into a large organization that applies 3D technology not only to the dental field but also to a wide range of other industries. Our vision is to expand our impact across various sectors and continue to innovate in partnership with our clients, echoing our motto of "Together, We Innovate."

Wide-angle lenses or short focal lengths offer a great opportunity for shooting landscapes, cityscapes, Milky Way photography, and Northern Lights photography.

Telephoto lenses are those beyond 50mm. These lenses are also physically longer than wide and normal lenses. The field of view is smaller but you gain significant reach.

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Super telephoto lenses have very different focal lengths, ranging from 300mm and beyond. When considering focal length and field of view, crop factor is incredibly important because you can gain significant amounts of reach using a crop sensor like Micro 4/3rds.

Our model scanner previously required silicone impressions. However, we have been developing a new technology, set to be released this month, which incorporates a small 3D camera placed inside the mouth for scanning the oral structure. This innovation eliminates the need for impressions. The intraoral scanner will be seamlessly integrated with the rest of our products.

Apart from the definition of focal length in photography as the measurement in millimeters from the lens to the image sensor, focal length has a direct impact on the angle of view, which is a static property of the lens in question but is impacted by the sensor crop factor.

Fixed lens camera focal lengths can also be multiplied by the crop factor of the sensor in order to compare it across formats. This is generally only important if you’re trying to replicate a look across focal lengths; i.e. you know you want a 135mm full-frame portrait style.

In several Southeast Asian countries, our products face challenges in achieving high sales due to price barriers. Many clinics in these regions tend to opt for Chinese-made devices. Recently, we established a branch in Malaysia and took a different approach. In this branch, we've set up a milling center. Dental clinics only need to purchase an intraoral scanner. Once a dentist scans a patient's oral structure, they transfer the data to one of our milling machines in the milling center. The machine then designs and processes the artificial tooth, delivering the finished product to the dentist.

For example, if I use a short focal length in portrait photography, parts of the body that are closer to me can be unflatteringly emphasized. On the other hand, in genres like landscape photography, it’s more common to see images taken with a wide-angle view, not only to capture the entire scene in a single image but to emphasize elements in the foreground.

Could you please share more about your internationalization strategy for these three advanced economies and your expectations from each of these markets?

In the future, we envision an extended role for AI in the design of dentures. Currently, following a dentist's removal of a decayed portion of a tooth, a human dental technician scans the removed segment and uses a computer program to design ceramic material for replacing the missing part. This meticulous process ensures a precise fit with the original tooth and adjacent upper/lower teeth. However, our goal is to leverage AI for the automatic design of dentures.

As per what you've said, DOF Inc. appears to be akin to Apple in the dental industry, offering a comprehensive ecosystem with various solutions. With your range of solutions, which can be quite extensive and costly, doctors can reduce treatment time but may incur higher expenses. However, in developing countries, clinics may opt not to invest in higher-quality equipment due to cost constraints. How does your product cater to this diverse customer base?

Camera zoom lenses allows to change the angle of view without moving and are more versatile than prime lenses. The downside is that maximum apertures are not usually as fast as the fastest prime lenses. For example, an f/1.4 zoom would be ridiculously expensive and massive.

Another notable advantage is the ability to provide a simpler and more efficient workflow. By manufacturing the entire set of machines, we streamline the entire process, encompassing all the necessary devices.

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Dental lab scanners typically come with a set of limitations. Firstly, to obtain an accurate 3D scan, you traditionally need to reposition the piece and capture different camera angles, often requiring fixation on a jig from multiple angles and sources. Secondly, the scanning and the construction processes are traditionally carried out separately. Could you please explain how the Freedom X5 overcomes these conventional limitations of dental scanners?

In the relation between focal length and depth of field, when all other values are equal, short focal lengths (or wide angles of view) have deeper depth of field relative to long focal lengths (narrow fields of view). Thus, the longer the focal length, the farther the hyperfocal distance will be.

Focal length determines many of the characteristics of the photos you can take as well as the physical dimensions of the lens.

This digitalization addresses the challenges associated with an aging population. Furthermore, it has positive global implications. Developed countries, including South Korea, have had skilled human technicians to create dentures. However, in other regions like Southeast Asia or Latin America, such skilled practitioners have been scarce. Patients in these areas have often resorted to tooth extraction due to the high cost of treatment. With the advent of digitalization, more efficient and cost-effective treatments become possible for these patients. I anticipate that this will create a much larger market than the current dental device market, with an influx of new patients who previously had limited access to treatment.

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Moreover, for a dentist who acquires our dental scanner and milling machine, the scanned data can be transmitted to our server. Subsequently, AI will facilitate the denture design process and send the design directly to our milling machine for fabrication.

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I believe that South Korea should pursue a two-pronged approach. Firstly, large conglomerates and the government should collaboratively plan and implement a long-term strategy for developing high-risk medical devices. Secondly, private companies, like ours in dental, cosmetics, and other sectors, should focus on developing mid-risk devices and penetrate these markets. We believe we've already made significant strides in this direction.

In South Korea, there are prosthodontics programs in colleges, but currently, there aren't many students aspiring to study prosthodontics. Even if students graduate with this specialization, they often do not want to become dental technicians due to the challenging nature of the work and less-than-ideal working conditions.

Hi Anne, it totally depends on the sensor size of the camera. For example, if you’re using a Micro 4/3 sensor camera with the 60mm f2.8 lens, since the crop factor is 2x, it means that you’re cropping the image the double, so technically it’s like shooting at 120mm focal length. Hope it’s clear. 🙂

Focal length touches upon many elements of the photography basics; composition, aperture, depth of field, and other aspects all shift when taking focal length into account! Each twist of the zoom ring or swap of a prime lens is a shift in the interplay of focal length and your creative vision.

While we do go into some depth here and there are some confusing elements surrounding the topic, I’m confident that by the end of this article, you’ll have a solid foundation on what is focal length and how it relates to digital photography.

Currently, we operate this model exclusively in Korea due to payment limitations in overseas markets. However, we are in the process of planning to integrate this model with the milling center in our Malaysian branch.

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In addition to the growing demand for cosmetic dentistry, advanced economies continue to require dental treatments for therapeutic purposes. Dental clinics in these countries often take dental impressions and send them to countries like China, where large dental laboratories are located. These labs receive dental impressions from the United States and European nations, manufacture artificial teeth, and ship them back to their respective countries. This approach is favored by advanced countries due to cost considerations. However, I firmly believe that digitalization has the potential to transform this industry as well. By investing in our scanners and milling machines, dental clinics can streamline the process, saving both time and cost. They can receive artificial teeth without the need for international outsourcing, which can ultimately make the entire process more efficient and cost-effective.

Focal length can feel a little abstract when looking at one lens versus another. One of the easiest ways to understand focal length is to look at images that use the lenses in question! To wrap up, here are some focal length examples for you to consider:

Zoom lenses are what anyone who has ever picked up a camera in recent times is familiar with. In fact, they are so common that I often find non-photographers get baffled when I hand them a camera with a prime lens attached!

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I emphasize that we get the field of view because again, lens focal length is inherent to a lens. A 25mm Micro 4/3rds lens has a 50mm full-frame field of view. However, it remains a 24mm lens with the distortion properties of a 24mm lens; it’s not magically a 50mm lens.

Can you help me understand why a lens advertised as 60 mm f2.8 macro is described as 120mm and equivalent to 35mm focal length? I am completely bewildered.

Remember that if you tend to specialize in any type of photography, it’s crucial to understand how focal length affects your image so you can have a better idea of what sort of lenses you should be shopping with, as well as the impact they have on a subject and background. You can download my PDF photography guide to get more information about this.

In fact, we already provide a rental service in Korea, where dental clinics can rent our scanners for $90-100 a month, with the flexibility to return the device whenever they wish. This rental model has been highly successful.

Foreign companies undeniably hold a dominant position in South Korea, particularly those hailing from Western countries like the United States, France, Germany, and Switzerland. These nations boast a rich history of developing medical devices, having done so for many years. In the early stages of medical device development, regulatory frameworks were not as well-established. Over time, regulations evolved alongside the devices themselves. This allowed these foreign companies to emerge as leaders in the field, securing a strong foothold in the South Korean market. Given the existing regulations, it is challenging for Korean companies to rapidly reach the same level as these established market leaders, especially in the short term. As I mentioned earlier, medical devices are subject to various regulations based on their risk levels. For high-risk devices, Korean companies face lengthier regulatory hurdles, even if their device quality matches that of Western counterparts.

Macro lenses have the highest magnification due to their unique construction, which reduces the focal distance they operate within and allow you to focus in very close subjects.

This concept can be complicated when the crop factor and the field of view come into play since we began to ask what is the equivalence of the focal length of a lens using it in a camera with a different sensor format.

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South Korea’s medical device exports increased by approximately 79 percent between 2019 and 2020. With this recent surge in international medical device demand, Korean medical companies have become highly competitive on the global stage. How important is international cooperation for the development of the Korean medical industry?

So what are the mm in lenses? The key is to understand that focal length is calculated by measuring the distance from the optical center of the lens to the image sensor, and this distance is measured in mm. The longer the focal length, the physically longer the lens will be. Lenses with a wider view will have a shorter focal length and are physically shorter by comparison.

However, using a prime lens means that you have to physically move in order to create a given field of view. Which kind of lens is better is an age-old question and really comes down to your own personal preferences!

Two key factors come into play here. The first factor is the exceptionally high caliber of dentists in Korea. In Korea, top high-school students often aspire to attend medical school, resulting in an abundance of highly skilled doctors in the field of dentistry. I firmly believe that Korean dentists rank among the best in the world. Given the sophistication of these clients—meaning the doctors themselves—medical device manufacturers must continually strive for excellence to meet their demands.

Let's delve into the current state of AI utilization in our product. When we scan the oral structure, our primary objective is to capture images of the teeth and gums. However, the scanner also inadvertently captures images of the tongue and cheeks. These tongue and cheek parts constitute unwanted noise data that must be removed. Conventional algorithms struggle to distinguish between the gums and the cheek since they share similar colors and forms. To overcome this, we have trained AI using historical data. This AI is then capable of effectively filtering out the tongue and cheek from the scans.

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Please note that lens compression is not related to the lens, but to the distance from the subject (Ex. You can achieve the same field of view and perspective shooting an element with a short focal length like 20 mm or cropping the same area from a 50 mm as long as both images are taken from the same distance).

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These lenses take on an expansive field of view that’s wider than what we normally pay attention to. An image taken with a 15mm lens will seem abnormally expansive, taking, for example, an entire landscape with ease.

Standard lenses or medium focal lengths are suitable for shooting many different genres like portrait, street photography, landscape, etc.

Lens focal length is a surprisingly nuanced topic! A simple physical measurement leads to so many considerations that go into how an image is composed. From the angle of view to depth of field, no aspect of a photograph goes untouched.

By taking the crop factor of a specific sensor and multiplying it by the field of view, we get the field of view as if it were viewed in the 35mm standard.

Standard focal lengths range from 35mm to 50mm depending on the type of camera sensor. The field of view provided by standard focal lengths approximates the field of view of the human eye.

Take the example of Koreans, who tend to consume hard foods. Therefore, our milling machines need to be capable of processing hard materials. In contrast, people in Western countries often consume softer foods, so milling machines must be designed to work with softer materials while maintaining higher speeds.

The depth of field is commonly expressed using units of length. The subject distance is measured from the focal plane of the camera (whose position is indicated ...

The angle of view in photography is the area of the scene that is captured by the camera sensor. This area is described in degrees of coverage in front of the camera.

Your company is relatively young, having been founded in 2012. Let's imagine that I return for an interview with you again in 2032, on your 20th anniversary. What ambitions or goals would you like to have achieved by then? What message would you like to share in that second interview?

Understanding your camera’s zoom ability helps you know what sort of pictures you can reasonably expect to take. Just like with an interchangeable lens camera (ILC), the camera will have a focal length range that tells you about the properties of the lens.

Focal length comparisons are incomplete without the infamous crop factor discussion. Nowadays, we have APS-C, Micro 4/3rds, medium format, and full-frame, all of which use a lens focal length description centered around 35mm film gear. While this made sense when the digital revolution began, it’s often simply confusing to parse nowadays.

Currently, AI and digital technologies are prevalent in various fields. You've previously mentioned that digitalization will reshape the industry. Can you explain how AI is integrated into your product and elaborate on your plans for further developing AI technologies?

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Hopefully, this article on explaining focal length has clarified some of the stickier aspects of the topic. Especially where they affect wide, normal, and telephoto fields of view.

As you all know, people from different countries have distinct dietary preferences, which necessitate more customized solutions. Let me illustrate this with dentistry as an example. Various countries have different staple foods. For instance, Korea, Japan, China, and the United States all have their unique dietary habits. Consequently, the materials used for artificial teeth, including their hardness, must be adapted to these preferences. To provide the most appropriate treatments for each patient, we collaborate with doctors and dentists from around the world.

Photos taken with a long focal length look more “compressed” as compared to shorter focal lengths, and allow you to capture subjects from a farther distance without losing image quality.

Dental markets tend to be more significant in advanced economies compared to developing countries, primarily because dental care often comes at a substantial cost. Currently, we are homing in on a noteworthy observation in these advanced countries: people in these regions tend to prioritize dental health from an early age. This emphasis on dental well-being is particularly prominent in the aesthetic aspect of dentistry, where the market for cosmetic procedures surpasses that of strictly treatment-based dental care. When considering facial aesthetics, teeth are often regarded as just as important as one's hairstyle. Therefore, I anticipate that the aesthetic dental market will continue to expand in the advanced nations in the future.

DOF Inc has spearheaded the shift towards greater digitalization where everything is interconnected. DOF’s innovations complete each other for more effective crown production involving the Craft X5 milling machine utilizing the 3D scan from the 5-megapixel dental lab scanner and the future AI-integrated intraoral scanner.

The concept of camera movement initially dawned on me a decade ago when I founded this company. Back then, dental CAD/CAM technology was still in its nascent stage, with just a handful of 3D scanners available worldwide. I recognized this as an opportunity for innovation. Up until that point, products typically involved fixing the piece in place using a jig, while I proposed moving the camera instead. This shift in approach was possible because the market was still evolving. As we introduced camera movement, it had several other positive impacts as well. We initially launched our devices in the United States, followed by Japan and Germany, and Korea came into the picture afterward. The introduction of camera movement marked our initial success in more advanced countries.

Focal length also relates to field of view (also called angle of view) because changing the focal length changes the field of view – I’ll explain more about how the field of view and focal length of a lens interact with each other in greater detail below.

As we step into normal focal lengths, which are closer to our human vision (like 35mm), this effect is subtle to invisible. However, once we hit telephoto angles of view, the background appears to be closer to the subject. This effect increases as your lens mm does.

The primary challenge associated with an aging population is a shortage of workers. We are already experiencing difficulties in recruiting developers. Simultaneously, I believe there are significant advantages in the medical sector, given that an aging population implies a higher number of patients in Korea. I believe that medical devices can play a pivotal role in addressing the challenge of increasing patient numbers by reducing treatment costs and improving efficiency. Korea, in my view, possesses distinct advantages in these two aspects.

In 2021, the South Korean medical device market reached a size of 9.1 trillion KRW. However, critics like Professor Sun Kyong of Kyung Hee University argue that this growth has largely benefited foreign companies, rather than domestic ones. Why do you think Korean companies have not been able to establish a dominant position in the Korean market? How can Korean companies regain their share of the domestic market?

Normal or standard lenses have a focal length between 35mm and 50mm in full-frame terms. When comparing across formats, they have a field of view that’s also equivalent to a normal lens. These lenses best duplicate how we see the world.

As you can see, the focal length we choose affects the final image. Also, the field of view and lens distortions fundamentally affect the type of photography you do.

Focal length is one of the main considerations when buying and selecting a lens. And understanding how focal length works is essential to capturing the photos you want. Otherwise, you’ll be choosing lenses with random angles of view that only serve to confuse you with choices.

Photographs taken with short focal lengths show distortion in certain elements; those closer to the foreground are magnified whereas all the elements in the background will show a diminished perspective.

Another approach we plan to implement is offering discounts, installment payment options, or leasing the scanner in exchange for committing to a certain number of scan cases per month.

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In developing countries where skilled technicians are scarce, patients often struggle to receive proper treatment. However, if a dentist in a developing country has access to this 3D scanner, patients can receive high-quality treatment. In summary, we've witnessed significant growth in the field of dental implants, and the next frontier for our industry is CAD/CAM technology.

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In dentistry, adapting products to different markets is crucial due to varying regulations and customer needs. South Korean companies like InBody and Osstem have succeeded globally. What are the key factors for international success in dentistry, and how do companies like Osstem achieve it while others struggle?

Focal length and depth of field are different properties of both a lens and sensor but are somewhat related. Depth of field is how much of a scene is in sharp focus. How narrow or wide the depth of field is, is an interaction between focal length, sensor size, subject distance, and aperture value.

As I mentioned earlier, credibility is paramount in the realm of medical devices. Currently, a dentist might purchase a scanner from company A and a milling machine from company B. If a negative outcome or impact on a patient occurs, the dentist is faced with the challenging task of identifying the root cause, often involving analysis of devices from different manufacturers. This process demands both time and effort. In light of this, many healthcare professionals prefer the idea of a single manufacturer assuming full responsibility for medical devices throughout the entire process. This becomes one significant advantage of offering a range of related devices.

Moreover, it is worth noting that medical devices with higher risks often come with higher added value. This emphasizes the pivotal importance of product credibility for such high-risk devices. It requires decades of treatment data to trust and use these devices, even if they offer superior functionality and performance. For example, one of my acquaintances attempted to import an affordable MRI machine from China, intending to sell it in Korea at a fraction of the cost of other MRI machines, only to face insurmountable challenges.

Once the 3D scan data is transferred to the machine and uploaded to our platform, technicians across the globe who use our devices can access it. For example, a dentist in the United States can upload the data, and dental technicians in Korea or China can apply for bids using their own designs. The U.S. dentist can then select the technician for their patient based on both quality and cost. I firmly believe that this digitalization will have a profound impact on our industry.

The second reason relates to regulations. Medical devices are subject to various regulations, which differ based on the devices' impact on the human body. As you previously mentioned, there exists a wide array of medical devices, and South Korea heavily relies on foreign medical devices and technologies. Nevertheless, I believe that South Korea particularly excels in fields with lower-level regulations, such as dentistry and cosmetics, leveraging the strengths of our manufacturers.

Given that DOF Inc. provides dental scanners to numerous countries globally, the data collected by our machines can be transmitted to a central server, enabling autonomous design. Historically, human workers were responsible for this design work, with associated costs ranging from $5 to $10 per task. Unfortunately, the availability of skilled human workers in this domain is decreasing. By implementing AI-equipped machines, we can significantly reduce the cost to approximately $1 per task, making this technology accessible to dental professionals worldwide.

A single convex lens mounted in a frame with a handle or stand is a magnifying glass ; Lenses are used as prosthetics ; Other uses are in imaging systems such as ...

Your firm specializes in three distinct dental solutions: dental scanners, including the main product Freedom X5, face scanners for regenerating 3D images, and milling machines used for crafting implants. Can you explain the synergies created by having these three interrelated components in the dental process?

Furthermore, it's worth noting that, historically, dental technicians have crafted dentures without ever seeing the patient's face. They relied solely on scanned images of the oral structure, without any knowledge of the patient's appearance. However, our face scanner allows dental technicians to view the patient's actual face, facilitating the creation of dentures tailored to the patient's unique features. This not only enhances patient satisfaction but also represents a significant advancement in dental technology.

A lens focal length that’s greater than 50mm is considered a long focal length. This view is narrower than the normal view we’re accustomed to when paying bare attention. An image taken with a 100mm telephoto lens will have a much smaller section of coverage than a normal or wide-angle field of view.

Focal length is the physical measurement of distance between the lens and the imaging sensor when the subject is in focus.

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By twisting the barrel of a zoom lens, you can adjust the focal length and field of view of your lens, which affects depth of field, distortion, and all other aspects of your image.

Over the past five years, the South Korean medical equipment industry has made significant strides in specific areas. South Korea is now a global leader in In Vitro reagents, dental implants, and various types of X-ray imaging for dentistry. When looking ahead to the next five years, which specific products or segments do you believe hold the potential for South Korean dominance?

How focal length works is by describing each lens in terms of millimeters (lens mm). This description is a hard-physical reality of the lens in question, no matter the brand, format, or aperture.

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In other industries, I believe that Korea can excel in providing cost-effective products, meaning we can offer high-quality products at competitive prices. In many general areas, Chinese companies can indeed offer cost-effective products. However, in the medical sector, credibility holds paramount importance. Consequently, I find it challenging for Chinese companies to enter this market due to their lower credibility.

One key to understanding focal length is recognizing how the look of the image changes using lenses with different focal lengths. Using a wide-angle lens, foreground elements are emphasized while background elements are pushed even further away, looking smaller than they really are.

Focal length in photography comes up far more often than focal distance, which is an entirely different property of a lens. Focal distance is related to focal length but is not dependent on it.

The simplest focal length definition is a description of the distance between the center of a lens and the image sensor when the lens is focused at infinity.

I believe that dental implants have been a major driver of growth in the dental industry for the past 10 to 20 years. Looking ahead, I see the CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) technology as having the most significant growth potential. Historically, human dental technicians manually manufactured artificial teeth, a task that demands extensive knowledge and craftsmanship. However, as we enter an aging society, there is a shortage of skilled human labor to perform this job. This is where I see substantial opportunities in the CAD/CAM market, which involves producing artificial teeth using computer software and machines, over the next five years and beyond.

The overall process works as follows: a dentist at the dental clinic treats a cavity, makes a 3D digital impression, and directly transmits it to the dental laboratory. The laboratory then fabricates artificial teeth and returns them to the dental clinic, where the dentist fits them to the patient. This streamlined process eliminates the need for physical impressions.

There are great apps and websites that allow you to calculate depth of field for a given focal length, aperture, subject distance, and sensor.

At present, patients typically have to return to the dentist one or two weeks after their initial visit for a dental impression, as it takes that long to manufacture dental prostheses. However, with our planned advancements, we envision the entire treatment process being completed within just one or two hours in the near future. For instance, if you visit a dentist located in a department store, you could consult with the dentist, spend an hour or two shopping, and then return to receive your crown. This significantly benefits both dentists and patients, as the process becomes much simpler and less time-consuming. Moreover, South Korea is witnessing an increasing number of medical tourists, for whom time is of the essence. Our technology can greatly benefit this demographic as well.

It’s important to consider that focal length is a static property of a lens that’s true regardless of crop factor; for example, a 16mm APS-C lens is a 16mm lens even if it has a 24mm equivalent field of view in a full-frame camera. We’ll see + in-depth info about this below.

These super long focal lengths are usually more expensive but they allow to capture subjects from a very far distance like in sports and wildlife photography, and to shoot other genres like deep astrophotography.

In practical terms, angle of view and field of view are used interchangeably in photography to indicate the way our cameras “see” the scene, and using a short focal length or a long focal length will change drastically the field of view or the amount of the scene that is photographed.