Hi.
A more simple way to determine what would be your "natural focal length" 
could be to have an eye looking at something through a reflex camera equiped 
with a zoom, and the other directly. Zoom in and out so that you cannot see 
any difference between the images of each eye.
I did it when I bought mine and arrived at about 50mm.
Don't know if it's representative, though.


web.4188a6e3e293e888aab3f0cb0@news.povray.org...
> Le Forgeron:
>
> Thanks, I did something similar this morning (made a mistake in the
> measurements though, I need to do it over again).
>
> I measured (or rather will measure again) my computer room - AND measure 
> the
> furniture in it (tall bookshelves, packing boxes, chairs, etc...) - 
> modeled
> everything in a POV file (just simple approximate pigments).
>
> I stand in a corner and just look at the room (using only one eye - I HAVE
> two eyes of course, but the comparison is meaningless if I use binocular
> vision)... note where my perception "falls off" on the walls (I might try
> putting marked stickynotes on the walls as markers later).
>
> I render, then keep adjusting the POV camera angle until it seems as
> identical as possible to what I perceive (deliberately ignoring too much
> peripherial vision). As a check, I derive extremes - I find the "this is
> DEFINITELY too much telephoto look", and I find the "this is DEFINITELY 
> too
> much wide angle", and then find the midpoint. Etc.
>
>
>

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