> > Now, as to camera lens. I assume you mean focal length.
>
> No, I mean Field of View (FOV).
Well, yes and no. The focal length of a camera lens (50mm
lens, 500mm telephoto, etc) is the rating by which the "field of
view" as you call it, is rated.
You seem to want what is known as a "normal" lens -- one which
approximates the field of view of the human eye. On a 35mm
camera, this is a 50mm lens.
You want a lens with a focal length roughly equal to the diagonal
measurement of the image sensor.
You've complicated matters with the virtual display, but with a
little bit of trial and error it shouldn't be too hard to figure out.
> I'm not going to be interested in anything closer than a few
> feet
> away - certainly not in a test setup, anyway. So the focal length
> of any
> camera I use should be fine.
That's focal distance, not focal length. Focal length controls the
field of view of the lens -- a telephoto, 500mm, on a 35mm
camera, would indicate an approximate field of view of between
.5 and 1 degree. There is probably a formula for calculating it,
but I don't know what it is off the top of my head, and this is an
offline mail reader program.
Focal distance is just how far away the subject is located...
> - - Anyone have suggestions to altering a camera's FOV? Either by
> different
> lens (any considerations? specific lens suggestions?) or by some
> other
> trick? Ideally, is there some way to _make_ a camera's otherwise
> fixed
> FOV adjustable? (I'm thinking these CMOS board cameras, here)
They used to make supplemental lens sets for point 'n shoot
cameras, which did exactly this. I have several sets of them, but all
they are is a lens, I think it was convexo-concave, which increases
or decreases the focal length (not distance) of the lens when placed
in front of it. There was 1 for wide angle, and 1 for telephoto.
Try this experiment. Take a magnifying glass, and put it in front of
your webcam's lens. Take notice of the difference. And then
extrapolate from there.
This shouldn't be too hard to make happen.
-- Chuck Knight
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