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Large sensors tend to have large pixel sizes, and this indicates higher sensitivity. To achieve high sensitivity and compact design, an industrial camera usually uses a 1/2.8″ CMOS image sensor.
Short focal lengths capture a wider view, making them ideal for sweeping landscape shots or environmental portraits, where it is important to capture the setting as well as the subject. Taken on a Canon EOS R5 with a Canon RF 24-105mm F2.8L IS USM Z lens at 24mm, 1/2000 sec, f/3.5 and ISO 100.
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Telephoto and super telephoto lenses are a great choice for sports photography because they make it possible to fill the frame with the subject without having to get close. Taken on a Canon EOS R with a Canon RF 600mm F11 IS STM lens at 1/1600 sec, f/11 and ISO 800.
Prime lenses are typically smaller and lighter than zoom lenses. The Canon RF 28mm F2.8 STM, for example, is very lightweight and compact at just 24.7mm long, making it ideal for travel and street photography.
For example, consider the AR1335-CMOS image sensor from onsemi™ that has a sensor size of 4.54×3.42 mm and a diagonal of 5.68 mm. Therefore, the optical format is 5.68*3/2 = 8.52 mm, which is expressed as 1/3.2″.
In this blog, you’ll gain expert insights by comparing different sensor sizes and knowing their use in embedded vision applications.
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Mount is used for attaching a lens to a camera body. The selection of mount depends on the sensor size. For instance, the C mount, which is the type of lens mount for machine vision cameras, is appropriate for a 1.5″ sensor. S mount lens, which is commonly used in industrial applications, is appropriate for a sensor size of 1/2″, 1/3″ or smaller.
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Some zoom lenses cover more than one of these categories, with some going all the way from wide-angle to telephoto, such as the versatile Canon RF 24-240mm F4-6.3 IS USM. Super-telephoto lenses used to be accessible only to dedicated professionals able to justify the investment, but advances in lens design and technologies have brought RF lenses with focal lengths above 400mm within the reach of a much broader range of users. The RF 600mm F11 IS STM, for example, is perfect for animal portraits and casual wildlife photography even in your back garden thanks to its short closest focusing distance, and is much more affordable than its pro 600mm counterparts. The same applies to the RF 800mm F11 IS STM, which is ideal for travel and wildlife, including specialist interests such as bird and aviation photography.
Camerafocal length
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The focal length of a lens is the distance (D) between the plane of the sensor (C) and the optical centre or nodal point (B) of the lens. This determines the lens's angle of view (A).
CMOS (Complementary Metal-Oxide Semiconductor) is a digital device for capturing light and converting it into electrical signals. It has a photodiode and a transistor switch for each pixel. When light strikes the pixel, it creates a voltage proportional to intensity. The voltage is sampled directly at the pixel.
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Lens extenders (also known as teleconverters) increase the effective focal length of your lenses. Find out how lens extenders can enhance your telephoto capabilities and prove helpful especially when you can't physically get closer to your subject.
• What is focal length? • Understanding prime and zoom lenses • How crop factor affects focal length • What is the focal length of the human eye? • Wide-angle, standard and telephoto lenses explained • Gaining extra reach with lens extenders and teleconverters
CMOS sensors are generally specified by their physical sizes. The size of the CMOS sensor determines the light-collecting surface area of the sensor. The dimensions of the sensor are defined by the resolution and the pixel size. As you may know, the size of a sensor is often measured in inches. The image sensor format is sometimes referred to as sensor size or optical format.
Undoubtedly, the size of the camera sensor is a major parameter that influences key aspects of imaging, including factors such as sensitivity, resolution, dynamic range, and low-light performance. Understanding sensor size and its implications for camera performance is critical in the development and optimization of imaging solutions.
Resolution is the ability of imaging systems to reproduce the exact object detail. Many embedded vision applications like autonomous mobile robots (AMR) and autonomous vehicles demand cameras to achieve precise 3D depth measurement. This would be achieved with the high-resolution feature of that camera. Selecting sensors with large pixel sizes is likely to have higher resolution.
Each application has different sensor size requirements to produce images. Let us discuss the factors to be considered while choosing a sensor of a particular size.
Also, some of the other available sensor sizes are 1/2.9″ (for Omnivision’s OV2311 CMOS image sensor with 3.0 μm x 3.0 μm pixel size) and 1/3″ (Onsemi’s AR0134 CMOS digital image sensor with an active pixel array of 1280H x. 960V).
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Yet, it’s important to acknowledge that with increased size comes higher costs, making larger sensors typically more expensive compared to their smaller counterparts.
Photographing small and distant subjects requires a long focal length to fill the frame with the subject. This is also handy for photographing wildlife that may be spooked by a photographer attempting to get close. Taken on a Canon EOS R with a Canon RF 800mm F11 IS STM lens at 1/40 sec, f/11 and ISO 1600.
Cameralens distance chart
When a full-frame lens is mounted on an APS-C camera, the smaller sensor crops the image, making the subject larger in the frame. The effect is to increase the reach of the lens, so that a 500mm lens on an APS-C camera has the same field of view as an 800mm lens on a full-frame camera.
What is focal length of lens
Embedded vision applications like automated license plate recognition, gesture recognition, robotic vision, drones, and AMR require high frame rate and global shutter features – depending on the nature of the end application. AR0234 from Onsemi is one of the most popular sensors used in such applications.
Camerafocal length comparison
Some lenses are compatible with lens extenders such as the Extender RF 1.4x and Extender RF 2x. Also known as teleconverters, these increase the focal length of a compatible lens by a factor of 1.4x and 2x respectively, allowing much tighter subject framing. The trade-off is a reduction in maximum aperture (1-stop and 2-stop respectively), but the lens still retains its autofocusing capability. Extenders are much smaller, lighter and more affordable than telephoto lenses, so they can be a great option for increasing your reach without having to carry an additional lens. Some lenses have an extender built-in. The Canon EF 200-400mm f/4L IS USM Extender 1.4x, for instance, incorporates a 1.4x teleconverter. This extends its normal focal length range of 200-400mm, which is perfect for many sports, to 280-560mm. That's very handy for more distant subjects, for example when the action in a football or rugby match is on the far side of the pitch. Some cameras, including the EOS R8, EOS R50 and PowerShot SX70 HS, have a digital teleconverter feature that magnifies the central portion of an image. On the EOS R6 Mark II, this feature gives a choice of a 2x or 4x digital zoom, which effectively doubles or quadruples the focal length of the lens you have mounted. On the EOS R6 Mark II and EOS R8 this can even be used in conjunction with a built-in 1.6x crop feature, which emulates the field of view of an APS-C sensor to increase the reach of the lens. Whatever you want to photograph, close or distant, Canon RF lenses offer a comprehensive range of focal lengths from 5.2mm all the way to 1200mm – and beyond to 2400mm with extenders – to help you get the shot you're after.
Prabu is the Chief Technology Officer and Head of Camera Products at e-con Systems, and comes with a rich experience of more than 15 years in the embedded vision space. He brings to the table a deep knowledge in USB cameras, embedded vision cameras, vision algorithms and FPGAs. He has built 50+ camera solutions spanning various domains such as medical, industrial, agriculture, retail, biometrics, and more. He also comes with expertise in device driver development and BSP development. Currently, Prabu’s focus is to build smart camera solutions that power new age AI based applications.
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Also, the resolution of the lens must match the pixel size of the sensor to achieve high-quality images. The quite popular camera resolution of 1600 x 1200 pixels often uses a larger sensor with a size of 1/1.8″, and now high-end 4K resolution uses a 1/1.2″ image sensor format.
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Bird photography is one specialism where it really helps to have a lens with the longest reach possible. The RF 200-800mm F6.3-9 IS USM lens is currently the longest reaching telephoto zoom lens for the RF mount, and its very versatile focal length range, combined with 5.5-stop optical image stabilisation, makes it ideal for photographers looking for an all-in-one wildlife lens. Plus, as nature photographer Guy Edwardes points out, "the longer the focal length, the quicker the background and foreground elements fall out of focus, while your subject stays sharp." Taken on a Canon EOS R5 with a Canon RF 200-800mm F6.3-9 IS USM lens at 637mm, 1/3200 sec, f/9 and ISO 1250 © Guy Edwardes
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Using the right lens is arguably the most critical part of your photographic setup. It's the optical quality of the lens, not the camera's resolution, that determines how sharp your images are. It's the lens that governs how much of the scene you're shooting is in focus, because it's primarily the lens aperture that dictates the depth of field. Crucially, it is also the lens's focal length that determines whether you capture a wide vista or a close-up of a distant subject. Here we'll explain what focal length is and how it determines what part of the scene is captured by the camera, and explore focal length related terms such as prime, zoom and telephoto.
Focal length is crucial because it determines the lens's field of view. The longer the focal length, the narrower the area of the scene captured by the lens. This means that a lens with a short focal length such as the Canon RF 16mm F2.8 STM captures a much broader view than a telephoto lens such as the RF 1200mm F8L IS USM. This is often expressed as a lens's angle of view, which is the angle between two lines drawn out from the nodal point to the outer edge of the lens's field of view. A shorter focal length, such as 24mm, produces a wide angle of view. A distant subject will appear smaller in the frame than it does when viewed through a lens with a narrow angle of view (that is, a longer focal length). Because a camera's sensor and image frame are rectangular, you will sometimes see three measurements given for a lens's angle of view – horizontal, vertical and diagonal (corner-to-corner). For the RF 16mm F2.8 STM, the angles of view are 98°, 74°10' and 108°10' (horizontal, vertical and diagonal), while for the RF 1200mm F8L IS USM they are 1°45', 1°10' and 2°05'. Often, however, just one angle of view is quoted, usually the diagonal.
There is another factor that affects the field of view in a given image: the camera's sensor size. APS-C sensors are physically smaller than full-frame sensors, which means APS-C cameras won't utilise the full field of view of a full-frame lens. Instead, the image will be cropped to the sensor's smaller active area. The effect of this reduced field of view is the same as zooming in, making the subject larger in the frame. This change in the framing can therefore be described in two ways: you can say the APS-C sensor introduces a crop factor or a focal length multiplier. The two are actually the same thing. For Canon APS-C cameras, the focal length multiplier (or crop factor) is 1.6x. This means that using a 50mm lens on a Canon APS-C camera gives a field of view equivalent to that of an 80mm lens on a full-frame camera (50 x 1.6 = 80). Hence, if you use the RF 50mm F1.8 STM lens, for example, on an APS-C camera such as the EOS R7, the lens is said to have an effective focal length of 80mm. The formula is the same when you use a zoom lens, but of course the calculation starts with the focal length to which you have set the lens. To be clear, all this also applies to RF-S lenses. These lenses are designed for use with APS-C cameras and therefore project a smaller image circle than full-frame lenses, but the focal lengths given in their names describe their optical construction, as explained above. When you fit them on APS-C cameras, you still require the same calculation to determine their effective focal lengths – so the Canon RF-S 18-45mm F4.5-6.3 IS STM lens, for example, has an effective focal length of 28.8-72mm when fitted on an APS-C camera.
In a very simple lens containing just one element, the focal length is the distance in millimetres between the focal plane and the centre of the element when the lens is focused at infinity. In a film camera, the focal plane is the film; in a digital camera, it's the light-receptive surface of the sensor. Modern lenses are much more complex than a single element, but they still have an optical centre known as the nodal point. That's the spot through which all light rays pass, converging to a point on their way to the sensor. The focal length is the distance between the focal plane and the lens's nodal point. This partly explains how two lenses can have different dimensions and yet the same focal length – it's the optical centre that matters, not the physical length of the casing. The maximum aperture also has an impact. The Canon RF 50mm F1.8 STM and RF 50mm F1.2L USM, for example, which have the same focal length but different apertures, measure 60.3mm vs. 115.1mm in length respectively (fully extended). Their maximum diameters are 69.2mm for the former, as compared to 89.8mm for the latter.
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Photographers and videographers often aspire to capture a "natural perspective" – a view comparable to that of the human eye. Comparison is tricky, however, both because the retina is curved and because human vision is normally binocular. Each of our eyes has a field of view of around 120-200°. It's a range because we can usually only detect movement at the outer edges of our vision rather than pick out specific details. There's around 130° of overlap in the field of view of our eyes, but our central vision equates to approximately 40-60°. It is generally accepted that a 50mm lens provides a perspective closest to the human eye, although the field of view is not exactly the same. Different lenses paired with different cameras and even lens extenders (see below) can offer a wide range of effective focal lengths, some of which are a close match to the perspective of the human eye. The Canon RF 5.2mm F2.8L DUAL FISHEYE lens takes a different approach. This specialist lens, part of Canon's pioneering EOS VR SYSTEM, is two fisheye lenses in one. The centres of the two lens elements are approximately 60mm apart – the average distance between the centres of the pupils in human eyes – to provide a natural stereoscopic viewing experience. On a compatible full-frame camera capable of 8K video capture such as the EOS R5, this left- and right-eye footage is captured as a single 180° VR file. After processing, the result is immersive VR footage where the viewer with a compatible headset can look up, down, left and right around a complete 180° field of view.
Cameralens mm chart
e-con Systems is also deeply committed to offer custom CMOS camera solutions that align with individual client needs. Our seasoned team of experts collaborates closely with clients to develop bespoke camera solutions. Our customization services include custom sensor selection, lens configurations, and integration with hardware and software components.
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As advancements continue in sensor technology, there remains a constant pursuit of enhanced performance from sensors of varying sizes. However, it’s undeniable that in many scenarios, larger sensors offer superior performance.
e-con Systems, with 20+ years of experience in designing, developing, and manufacturing OEM cameras, has a track record of equipping clients with world-class CMOS camera modules. Some of the use cases we have successfully covered include industrial, retail, agricultural, medical, and more. These modules are seamlessly compatible with several embedded platforms, including NVIDIA Jetson. Our portfolio includes sensors from various manufacturers, covering a broad spectrum of sizes and capabilities. Below is a comprehensive table of the sensor sizes and corresponding sensor names in our portfolio.
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A visualisation of the approximate angle of view of lenses with different focal lengths, from 15mm (ultra-wide) to 400mm (super-telephoto). (Sensor size also affects the maximum angle of view possible; for simplicity, this assumes lenses are attached to a full-frame camera.) The longer the focal length, the narrower the angle of view.
Cameralens size chart
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Canon offers lens extenders to suit RF lenses (left) and EF lenses (right), which can increase the reach of a compatible lens by up to double. They can be a great option if you need to travel light, because they are much more compact than a second lens.
It is a 1/2.6″ (Diagonal 6.8 mm) optical format CMOS sensor with a 3.0 μm x 3.0 μm pixel size. It is a global shutter sensor that is used for accurate and fast capture of moving scenes at 120 frames per second at full resolution. See3CAM24_CUG from e-con Systems is a color global shutter camera based on the ARO234 sensor.
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Nikoncamera millimeters
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Industrial cameras might have issues like lens vignetting/lens shading, which is a gradual reduction of an image’s brightness or saturation from the image center to the four corners/ edges. This happens when the image format (or circle) of the lens is too small for the size of the sensor. So, to mitigate this, the image circle diameter must fit or be larger than the sensor size.
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Light diffusion refers to the process by which light is scattered or spread out in various directions as it interacts with a medium or material.
As discussed before, a large sensor contains larger photosites that are more receptive to light, thereby enhancing the camera’s ability to capture low-light images in comparison to a small sensor. Two of the popular sensor sizes targeted for low light performance are 1/1.2″ ( such as the Sony® IMX485 based 4K-resolution CMOS image sensor) and 35mm full-frame.
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Lenses can be divided into two types: prime and zoom lenses. Prime lenses are those with a fixed focal length, such as the Canon RF 35mm F1.8 Macro IS STM, RF 85mm F1.2L USM and RF 100mm F2.8L Macro IS USM. A fixed focal length means that the perspective of the image can be changed only by physically moving the camera closer towards the subject or further away. In contrast, zoom lenses have variable focal lengths. The Canon RF 14-35mm F4L IS USM, for instance, offers any focal length from 14mm to 35mm, while the popular RF 24-105mm F4L IS USM offers focal lengths from 24mm to 105mm, a broad range which makes it an excellent choice for everyday photography. Meanwhile, the RF 100-500mm F4.5-7.1L IS USM is a favourite lens for wildlife photography when the distance between the camera and the subject can vary dramatically. This versatility means zoom lenses are more convenient because you can carry just one lens to be prepared for a range of shooting situations. However, prime lenses also have great benefits, such as being smaller and lighter or offering better optical quality and larger apertures. Find out more about choosing between prime and zoom lenses.
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Image sensors such as CMOS have seen their use cases grow significantly in size across many industries today. And you can also see major differences among the designs of the image sensors. For instance, these sensors come in varying sizes.
Lenses can be divided into three broad categories according to focal length: wide-angle, standard and telephoto. Wide-angle lenses – loosely defined as lenses with a wider field of view than the human eye – are lenses with a focal length up to around 35mm. These are useful for large group portraits, architectural photography and capturing expansive vistas in landscape photography. They are also popular with vloggers who want to include plenty of their environment in the frame. Lenses with focal lengths below about 24mm (full frame equivalent) are sometimes referred to as "ultra-wide". Standard lenses are those with a focal length of around 50mm, or more broadly from about 35mm to 85mm. These, as we have noted, are generally said to have a "natural perspective" comparable to that of the human eye, making them a popular choice for travel and portrait photography as well as all-purpose lenses whenever a distortion-free perspective is desired. Telephoto lenses – those with a focal length of around 85mm or more – produce a more tightly framed view than the human eye, making them ideal for photographing distant subjects without moving closer to them. This includes photographing people at social events and capturing outdoor portraits. Lenses above 300mm are often called "super-telephoto". Lenses such as the RF 600mm F4L IS USM and RF 800mm F5.6L IS USM are highly valued for sporting events and wildlife photography when it's impossible to get close to the subject. The longer the lens, the more tightly the subject can be framed, or the more distant the subject can be.