![]() 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. You can always fit more into the frame with a wide-angle lens, no matter how close you get to your subject. These two factors combine to make wide-angle lenses, ones of inclusion. Wide-angle lenses also appear to have more depth-of-field at any given aperture setting than longer focal lengths (they actually don’t, it has to do with lens to subject distance which also changes with focal length).The shorter the focal length, the closer you need to get, and the more background is included. But, at the same time wide-angle lenses also include quite a bit of the background. The wide field-of-view means that you have to move in close to your subject to fill the frame.Wide-angle lenses have two characteristics that affect composition: That’s 35mm or shorter on a full-frame camera, 20mm on APS-C, and around 18mm on micro four-thirds. You can think of any lens with a field-of-view wider than around 63 degrees as being a wide-angle. Wide-angle lenses are lenses of inclusion The next points explore the relationship between field-of-view and composition. This table shows the field-of-view of common focal lengths with full-frame, APS-C and micro four-thirds cameras. 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).Ī 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. 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). 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. 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).Ī 50mm prime lens has a field-of-view of 47 degrees on a full-frame camera. There are two factors that determine the field-of-view of a lens:įield-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 not as important as field-of-view ![]() There are four fundamental things to know and understand about the focal length and composition. ![]() 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. The focal length of a lens (and your point of view) determine how much of the subject your camera sees. ![]()
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