P3D Re: On Film Deviation

[aifxtony@xxxxxxxxxxxxx (Tony Alderson)]

>Challenging question: Would you say that our definitions of normal, wide
>angle and telephoto lenses also depend on viewing conditions?<

Well, I'd have to think about it before I'd have anything intelligent to
say. (Not that that stops any man from prattling... ;-)  )  Offhand, I'd
say yes, except perhaps for extreme wide angle lenses (fisheye).  Isn't
perspective really a function of camera-to-subject distance, and focal
length just a magnification?  Isn't our evaluation of a photo based on our
angle of view?

At least that's how it seems for 2D pix.  I'm not so sure stereo is the
same. I've never felt in command of the concepts of the shape of the stereo
field. I am, in fact, studying Abram Klooswyk's recent posts on the
subject, and intend to follow up some of his references.  I'm thinking of
setting up some more methodical experiments, beyond the "don't worry, fake
it" approach most of us seem to follow. We've had lots of pontification and
nifty charts, I'd like to compare these different methods on the same
subject. I can control parameters pretty easily in the computer, although
I'll have to be careful to set up a meaningful scene.

But don't hold your breath. Andrea Blair has got me thinking about bugs; I
want to dig my Hyponar out of the closet and hunt black widdow spiders.

Tony "Humble and darn proud of it" Alderson
aifxtony@xxxxxxxxxxxxx



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