This change in field-of-view means that you have to move further away from your subject in order to fit it in the frame, which also changes the perspective (giving the compressed effect that characterizes short telephoto lenses).

Field of viewcalculator

Note: this is the second in a series of articles on dPS this week talking about composition. See: Using Framing for More Effective Compositions and look for more over the next few days.

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Field of view of lensescalculator

The same applies to wide-angle lenses. A 21mm prime lens has a field-of-view of around 92 degrees. That’s a nice wide field-of-view ideal for landscape photography, or creating images with dramatic perspective.

Telephoto lenses are ones of exclusion. They have a narrow field-of-view. Fill the frame with your subject, and you won’t get much background in at all. It is also easy to throw the background out of focus by using a wide aperture, and making sure there is sufficient distance between your subject and the background.

Lenses are the eye of your camera. The focal length of a lens (and your point of view) determine how much of the subject your camera sees.

Field of view of lensesnikon

This photo, taken with an 18mm lens (APS-C), includes the buildings, the city wall, the reflection in the water, the city trees disappearing into the distance, and keeps everything in sharp focus.

Field of viewdefinition microscope

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A prime lens with that focal length doesn’t exist (you could choose between a 28mm or a 35mm depending on whether you wanted a slightly wider or a tighter field-of-view), but you can set that focal length if you have a zoom.

But put it on an APS-C camera the field of view narrows to around 65 degrees. It’s still a wide-angle, but the effect is much more moderate. It now has nearly the same field-of-view as a 35mm lens does on a full-frame camera

is a writer, photographer, traveler and workshop leader. He’s an experienced teacher who enjoys helping people learn about photography and Lightroom. Join his free Introducing Lightroom course or download his free Composition PhotoTips Cards!

Field-of-view (sometimes called angle-of-view) is far more important than focal length, because it tells you how much of the scene the lens sees. However, as field-of-view changes according to sensor size, manufacturers tell us the focal length instead. Focal length is a fixed measurement that doesn’t change (it is literally the distance from the middle of the lens to the focal plane, which is the sensor).

The S-mount is a standard lens mount used in various surveillance CCTV cameras and webcams. It uses a male metric M12 thread with 0.5 mm pitch on the lens and a corresponding female thread on the lens mount. S-mount lenses are often called "M12 lenses", the exact thread is M12x0,5 (0,5mm pitch). Because the lens mounts are usually attached directly to the PCB of the sensor, they are often called "board lenses".[1] The supported sensor formats range from smaller than 1/6-inch type up to 1-inch having an 16mm diagonal sensor. The lenses lack an iris control. S-mount lenses do not have a flange and therefore there is no fixed lens to sensor distance and they must be adjusted to focus.[2] Due to the small size of the lens barrel, performance is somewhat limited compared to larger lenses[3] and most S-mount lenses are relatively slow (f/1.6 and slower). High-end CCTV cameras generally use C/CS-mount lenses, where much faster apertures like f/1.0 are common.

Extremely low profile and compact design allow 8MTF-200 to be incorporated into many different types of scanning systems and easily mounted to most common ...

Can you think of anything else that photographers ought to know about focal length, field-of-view, and composition? If so, please let us know in the comments. I’d like to hear your thoughts.

Field of viewhuman eye

You can think of any lens with a field-of-view wider than around 63 degrees as being a wide-angle. That’s 35mm or shorter on a full-frame camera, 20mm on APS-C, and around 18mm on micro four-thirds.

Field of view of lensesformula

This photo was taken with a 14mm lens on an APS-C camera. It has the same field-of-view as a 21mm lens does on a full-frame camera.

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They have the same focal length but each one is designed for a different purpose. The 16mm wide-angle is designed to keep straight lines straight. The fisheye doesn’t try to do that, and as a result has a much wider field-of-view.

A telephoto lens is one that has a field-of-view of around 30 degrees or less. That’s around 85mm or longer on a full-frame camera, 50mm on an APS-C camera, and 40mm on micro four-thirds.

The slightest change in your point of view makes a dramatic difference to the composition of the photo. The shorter the focal length, the more this applies. As wide-angle lenses include so much background it can be difficult to simplify the composition and remove all distractions. There’s no way around it, it’s just a characteristic you have to embrace.

Field of view of lensesexplained

My new ebook Mastering Composition will help you learn to see and compose photos better. It takes you on a journey beyond the rule of thirds, exploring the principles of composition you need to understand in order to make beautiful imag

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I took this photo with a 35mm lens, a normal lens on an APS-C camera. It lacks the dramatic perspective, and wide field-of-view of the photos taken with wide-angle lenses. But it includes more of the background and shows less compression than the photos taken with telephoto lenses.

Lens angleof viewchart

If you have a normal prime lens you can open the aperture up to defocus the background, sometimes quite dramatically if you get close enough to the subject. But, you can also often stop down enough to get everything within the frame in focus.

This photo, taken with a 50-150mm lens set to 72 mm (APS-C), shows the woman’s hands and the textiles she is selling. There is not much in the background at all.

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A 50mm prime lens has a field-of-view of 47 degrees on a full-frame camera. This field-of-view approximates what we see with our own eyes. But what happens when you put the 50mm lens on an APS-C camera (crop factor of 1.6x)? The crop factor of the smaller sensor means that the lens now has a field-of-view of around 30 degrees, making it a short telephoto lens.

27 millimeter. Caliber is bore diameter, not a measurement system. It can be expressed in centimeters, millimeters, inches, or decimals of ...

These two factors combine to make wide-angle lenses, ones of inclusion. You can always fit more into the frame with a wide-angle lens, no matter how close you get to your subject. The background is also more likely to appear more in focus, than it is with longer focal lengths. Getting in close, creates the dramatic perspective that some photographers love. It emphasizes line, and creates a sense of depth, that images taken with longer focal lengths can lack.

If you want the equivalent of a 50mm lens on an APS-C camera you need to use a focal length of around 31mm, as it has the same field-of-view (47 degrees).

You may already be familiar with the basics, and understand the difference between, say, wide-angle and telephoto lenses, but let’s dive into the the topic a little deeper to see what’s really going on.

Normal lenses, those with a field-of-view somewhere around 55 degrees, occupy the middle ground between wide-angle and telephoto. They don’t create images with the dramatic perspective that you can obtain with a wide-angle, nor do they exclude the background to the same extent as telephotos.