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| p.1 #5 · what is the EFOV of a 1:1 format 28mm lens? |
Kit Laughlin wrote:
And what will be the rough EFOV, in 135-land? My guesstimate is around 32mm EFOV, but it is late here...
Effective frame of view between two different aspect ratios - rectangular 35 and square- is the impossible part of course. It seems obvious enough but when you are shooting - and if you are not used to square - it could be disorienting because in the vertical dimension, you get the same as with the 35mm but in the horizontal it would be like shooting with a 42mm lens on 35. Where things get crazy also is when you calculate what is required - effective focal length wise to 35 - to get the same horizontal field of view on the square as you did with 35mm when using the 28. You would need something equivalent to about a 19mm lens in 35mm land.
So, vertical field of view, nothing changes. When "cropping" the 28 to square in the horizontal dimension, it's like using a 42mm lens (as above) on 35 (to achieve roughly 46 degrees). If you want the same 65 degree horizontal field of view on the square as you got with the 28 on 35mm, you would need to be using close to a 19mm lens. All of that is relative to FF 35. I think that's right. Things get confusing after a while.