Rethinking focal length conventions

Started 7 months ago | Discussions thread
FrancoD Forum Pro • Posts: 15,574
Re: 6%

This is your problem :

" 43mm is actually the perfect focal length for full frame. It corresponds to the sensor diagonal of 43.27mm."

just because someone came up with that idea it does not mean that it is correct.

It probably is for some but not for others.

What I do mean by that is that human field of view is not a fix number.

Find 10 charts showing what our field of view is and you will get close enough to 10 different set of numbers.

Here is one

just for fun this is another one

there is some agreement that the main field of vision is around 60 degree but your pet lens , the 43mm Pentax has a field of view of 53 degrees , so yes somewhat around the middle of the various charts but again it isn't an exact number and that is why other manufacturers have not bothered making one.

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