Lensfocal length comparison

- When you shoot macro On many macro lenses, you usually have to be at the closest focusing distance to achieve the maximum magnification. But you don’t always want to be too near your subject, especially if you are shooting sensitive creatures such as insects.  Tip: Use a a telephoto macro lens like the EF180mm f/3.5L Macro USM (C.F.D: 0.45m) or the EF100mm f/2.8L Macro IS USM (C.F.D: 0.3m) to achieve life-size magnification even when shooting from some distance away.

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Unravel the “secret code” in a lens name, and find out about the story behind the red rings and white bodies on some lenses.

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Focaldistancevs focal length

Many people think that the closest focusing distance and the working distance of a lens are the same thing. They are related concepts, but they are not the same!

A lens that has a very short closest focusing distance allows you to achieve sharp, in-focus images with a shorter working distance.

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Know this: Compact cameras may carry specifications such as “1cm macro”. This refers to the working distance of the lens, not the closest focusing distance.

focal length中文

While traditional lenses have gone far to help the millions of people who suffer from farsightedness or nearsightedness, they add a marked spherical, convex curvature to the shape of the lens. This can distort the appearance of the eyes and facial areas. Traditional convex lenses can create a magnifying, bug-eyed effect on farsighted prescriptions or a minimizing, beady-eyed effect on nearsighted prescriptions. This noticeable curvature of the lens distorts the appearance of the wearer and the glasses alike, detracting from overall perceived attractiveness while also dealing an unnecessary blow to self-confidence.

Not only are ‘coke bottle lenses’ a thing of the past, but aspheric lenses also offer a better degree of vision correction. When wearing traditional lenses, you may notice some visual distortion when you look anywhere other than the direct center of the lens. Aspheric lenses, on the other hand, promote a wider field of vision with better peripheral vision and more consistent overall image magnification, allowing for clearer and more accurate vision. This is the same reason many photographers prefer aspheric camera lenses - a wider field of vision means more of the beautiful world is accurately captured in a single glance.

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Canon EOS cameras have a focal plane mark on the camera body. The image sensor is located under this mark. The focusing distance is measured from this mark to the subject. If the lens has a distance scale, the shortest distance indicated on the scale is equivalent to the closest focusing distance.

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FOV to focal length

Another factor to consider is that, due to their flatter profile and closer proximity to the face, aspheric lenses may produce noticeable reflections for some wearers. Anti-reflective coating is recommended for all aspheric lens wearers to eliminate any potential for visual distraction that reflections can cause.

- When you are trying to create bokeh Shooting with the camera closer to the subject results in a shallower depth-of-field, which helps to create a stronger background bokeh effect.

By satisfying several conditions, a large bokeh can be obtained even with a standard zoom lens. Find out more as I explain how to do so with the help of some photos of flowers. (Photo & text by: Kazuo Nakahara)

Focal length formula

- When you are shooting in a tight space If the closest focusing distance is big, you will have to stand further away to focus on your subject. Framing and composition aside, this is also why it would be hard to use a telephoto zoom lens like the EF70-200mm f/4L IS II USM (C.F.D: 1.0m) to photograph someone sitting right across the table from you in a small, cozy café.

As you can see, aspheric lenses offer many aesthetic and vision-correcting benefits for their wearers. But just like any prescription, these types of glasses or contact lenses should be thoroughly discussed with your eye doctor to make the best decision for you. Even if you’re considering non-prescription readers with aspheric lenses, it's worth it to mention the change to your doctor.

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Aspheric lenses are slimmer, flatter optical lenses compared to traditional prescription lenses. These lenses are available in both glasses and contacts, making more stylish options available to prescription lens wearers than ever.

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Your eye shape is unique to you and you alone; this means that your lenses, whether aspheric prescription or non-prescription, must be customized to your unique eye shape. An experienced optometrist can assess your vision needs and recommend the most appropriate and flattering lenses for you. Get in touch with our team today to discuss your interest in aspheric lenses!

Other than brightness, what sets an f/2.8 lens apart from an f/4 lens? Using the EF70-200mm f/2.8L IS II USM and the EF70-200mm f/4L IS USM, I will show how the two differ by comparing the apparent resolution and bokeh size. (Photos by: Ryosuke Takahashi)

In contrast, the working distance (see B below) refers to the distance between the front end of the lens and the subject.

Focus distance

With the advancement of aspheric lens technology, we now have more glasses frame styles available to more people than ever, with significantly less bulging of the lens and a lightweight feel for comfortable wear. These advanced lenses are cut to a slimmer profile, with much flatter curves that are strategically shaped depending upon the wearer’s prescription. This slim profile means that the glasses frames can sit closer to the face for a much more natural, streamlined look. This is a big advancement for folks with especially high prescriptions. If you’re in the market for aspheric lenses, limited frame materials, shapes, and sizes are no longer an issue, either.

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Minimumfocus distance

Finally, as mentioned in the beginning of this article, aspheric lenses are also an option for some contact lens wearers. However, the performance of aspheric contact lenses, when compared with that of aspheric glasses, may leave something to be desired. Many find that regular, spherical contact lenses work just as well, if not better than the newer aspherical contact lenses do. With two primary options of aspheric contact lens prescriptions being bifocal and multifocal, visual aberrations can be corrected in the wearer. However, visual contrast may reduce slightly, while glare caused by driving at night may increase - particularly for those who wear multifocal aspheric contacts. For these reasons, aspheric contact lenses may not be for everyone.

Tip: There are pitfalls to shooting too close It’s great to have the freedom to be able to shoot close to your subject, but too close and the lens hood and lens shadow might be captured in your shot—not ideal for some shooting scenes! Take the necessary precautions. If your lens doesn't have built-in Macro Lites, consider if you want to invest in a flash that is designed for macro photography.

Capturing beautiful bokeh circles is one of the photography techniques that I would recommend trying. Once you have mastered the trick to creating them, you’ll be able to capture such photos effortlessly. Here, I will explain bokeh circles are formed as well as a few tips to capturing them. (Reported by: Kazuo Nakahara)

The major disadvantage of aspheric lenses is their price. These advanced vision correcting lenses cost more to manufacture than traditional lenses do, involving more steps, more precision, and more labor. If you have an extremely mild need for vision correction, then aspheric lenses may not be the most logical choice for you.

Focal length

If the word aspheric is new to you, we’ll break down everything you need to know about what aspheric lenses are, how they work, and the benefits and drawbacks of wearing them. By the end of this article, you’ll feel primed and ready to discuss aspheric lenses with your doctor if they are of interest to you.

This series is all about answering questions regarding lenses that you thought you knew but didn’t. In this article, we look at one lens specification that you might want to consider when you buy lenses or choose which one to use: The closest focusing distance, also known as the minimum shooting distance. (Reported by: Shirou Hagihara, Digital Camera Magazine)

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Born in 1959 in Yamanashi. After graduating from Nihon University, Hagihara was involved in the launch of the photography magazine Fukei Shashin where he worked as an editor and a publisher. He later resigned and became a freelance photographer. Currently, Hagihara is engaged in photography and written works centring on natural landscapes. He is a member of the Society of Scientific Photography (SSP).

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The closest focusing distance of a lens (see A below) refers to the shortest distance that must be between your subject and the surface of the image sensor (the focal plane) for the lens to focus. It is not affected by the length of your length, and does not change even if you zoom your lens.

The technology behind aspheric glasses and contact lenses is directly related to advances made in camera lens technology. Just like the human eye, some camera lenses are shaped in such a way that visual aberrations and distortion can occur in the images they capture. The shape of the eye can also contribute to distorted vision. That’s why lenses are specially designed to balance and correct for the unique shape of a person’s eye—and why the technology has had to come a rather long way.

In general, many people with moderate to high need of vision correction for nearsightedness or farsightedness can benefit from the advances of aspheric lenses, particularly if worn in prescription glasses. Those with lower prescriptions will not see noticeable improvements to make the cost of aspheric lenses worthwhile. While some may want to try aspheric contact lenses, particularly those with bifocal rather than multifocal prescriptions, the benefits are mixed and should be discussed with your eye doctor. Those with astigmatism may not benefit as high as others and may be better off discussing toric lens options. Finally, aspheric lenses are a good option for many who use non-prescription reading glasses, too! If your readers are at a high reading power of +4.00 or higher, you may want to explore aspheric options.