P3D R: PHOTO-3D digest 3682 beamsplitters.

["Sergio Baldissara" <winter@xxxxxxxxxx>]

> From: Olivier Cahen <o_cahen@xxxxxxxxxxxxxxxx>
> Many people seem to want beamsplitters, and they ask for addresses of
> beamsplitter vendors.
> I do not understand why they want to purchase such a stupid device,
> since it can only make pictures with such a huge keystoning that they
> are definitely unsuited to projection, with absolutely no means to
> compensate this keystoning, unless these people can also purchase only
> slide mounts cut in shape of keystones.
did you ever try projection? I'd never try to cut a beam-splitter slide and
mount it in separate 2"x2" frames, nor in a "Nimslo format" Realist-type
frame, but I project whole 35mm slides throught a Stitz splitter with
adjustable mirrors.
It just needs a single projector, vertical alignement is easy & fast (one
just has to rotate the splitter), so is horizontal matching (just turn the
ring for focal-lenghts).
May be the trapezoid "keystone" effect of both devices compensate, but
actually keystoning is not a problem for me.
I agree beam splitters aren't the best way to shoot stereo pairs, but
they're the easier & faster way for lazy potographers like me. Splitters
take little room, so one hasn't to choose between a reflex camera or some 3d
equipment to carry around when travelling or whenever he wants to go around
without carrying a big bag.
Sergio