Why does nikon....

Started May 28, 2013 | Discussions thread
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Terry Vickers Regular Member • Posts: 332
Re: no such thing
2

Focal length in photography is the distance of the rear nodal point of the lens to the image plane.

The formula for FOV = 2 arctan (x / (2 f) where x is the diagonal size of the sensor.

Obviously by changing the x above it will change the FOV regardless of the focal length.

FOV or AOV would probably be a more accurate way of naming lenses in terms of their "zoominess" but it's one of those conventions that has stuck. So we have to use the crop factors to get traditional 35mm FOV equivalents. While a bit of a confusing I think it would be more confusing to call something that it isn't ie. calling a 35mm focal length 50mm when it is in fact 35mm.

The use of equivalents is mainly there to have a commonly understood reference. More convention than anything else.

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