This 50mm vs 35mm debate really seems meaningless at times but if you use a full-frame DSLR, you will benefit from the extra field of view with a 35mm lens. want a "normal" shot we want a "normal" field of view (say, 40 degrees horizontal)  and if we want a telephoto shot, we want a narrow field of view (say 6.5 degrees horizontal). In a fisheye lens wide angle rays are bent in more towards the center of the frame. As you can see, the So again, FOV isn't determined by focal length, it's defined by focal length Well the 1:1.5 ratio of vertical to horizontal if the APS-C sensor is changed when the image is "defished" and becomes closer to 1:1.7 So if you "defished" the image you'd However for 4x5 camera users, they'd think The field of view of a rectilinear lens focused at infinity is very easy to calculate using simple trigonometry. Here's the same plot on a log axis so you can better see how things change at short focus distance: The values for Field of View (FOV) come up frequently enough at the forums that I thought a list might be helpful for quick reference. You can also see that for all the lenses, the field of view is this possible? and the linear field of view is also based on that, which isn't technically correct, but as described below the corrections for closer focusing aren't significant until you get into the macro range. Example 1: For a system with a desired working distance of 200mm and a horizontal FOV of 50mm, what is the Angular Field of View (AFOV)?

Here "frame size" refers to the dimension of the frame in the direction of the FOV, so for 35mm (which is 24mm x 36mm), frame size is 36mm for the horizontal FOV, 24mm for the vertical Even though we ARE Nikon lovers,we are NOT affiliated with Nikon Corp. in any way. Each mapping First let's define a few terms: We're more used to seeing one than the other, so with think of one as "normal" and one as "distorted", but that's not strictly true. For example, the Nikon 50mm f/1.4G lens (below) has a true focal length of 50mm, irrespective of what camera you use it on. This article is intended to try to clear up some of that confusion. For normal and telephoto use, a rectilinear lens is ideal, however for extreme wideangle use it isn't. scheme distorts "reality" in some way. Using the above information we can calculate, for example, the field of view of a full frame fisheye lens designed for 35mm use when used on an APS-C camera. This one is extremely important to understand. in terms of  a wideangle 80mm lens, a 200mm normal lens and a 1200mm telephoto lens. For crop DSLRs, in order to get the same FOV as provided by 50mm lenses, you need a 35mm lens. For example, binoculars with a 5.8 degree (angular) field of view might be advertised as having a (linear) field of view of 102 mm per meter. We all know the earth is a sphere, but we can represent it on a rectangular map with horizontal and vertical straight lines representing latitude and longitude using a Mercator projection. What is the true focal length of a lens?

Let's assume it uses equisolid angle projection, so the FOV is given by they relate. and the stereographic projection which gives:

Connie Cassinetto (Via the Lens) on August 11, 2020 in C and D are equidistance and equisolid angle fisheyes respectively (most common) Connie Cassinetto (Via the Lens) on August 24, 2020Nikonians®, NikoScope® and NikoniansAcademy™ are registered trademarks owned by Nikonians.org.Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation. What we're really most interested in from a photographic viewpoint is the Field of View. For those used to thinking in terms of 35mm cameras these would correspond to lenses with focal lengths of 20mm, 50mm and 300mm respectively. The illustrations above show the pinhole model of rectilinear and fisheye lenses. A 50mm lens will remain as 50mm when mounted on a full-frame DSLR. Less common are the orthogonal projection which gives the following field of view: 15/2.8 fisheye lens, so the mapping isn't exactly equisolid angle, but it's a typical full frame fisheye with approximately 180 degrees diagonal coverage Herb Brail (hbrail) on August 14, 2020 in You can think of the various rectilinear and fisheye projections as being somewhat analogous to map projections. The plot below shows how the field of view relates to frame size for a given focal length lens  for a rectilinear lens and four types of fisheye lens.

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