Re: Orthoscopic free viewing

[P3D Greg Erker <erker@xxxxxxxxxxxxxx>]

>However, my camera has bellows which
>can extend quite far if I do
>close up work which would change the
>distance to the film plane so 65 mm is not
>really the right distance always.

  True. If you rack the focus out to lifesize
it will actually act like a 130 mm lens (65+65).
Focusing at 1 metre won't change the effective FL
much (about 70 mm effective FL by my calculations).

  If this is a big concern then you could add
closeup lenses as well as rack the focus out since
a closeup lens tends to shorten the FL.

> And what about my 180 mm lens?

  If ortho is important then you need to view
your transparencies with 180 mm FL lenses and
your prints with 180x2 or whatever lenses.

  Orthostereo isn't easy if you keep changing
camera lenses :)


>Do viewers exist with zoom lenses?

  None that I've heard of, though they would
be theoretically possible. Big $$$ though.

>Or perhaps interchangeable lenses like the cameras?

  Same answer as above. Smaller $$$ I'd guess.


>Do you sell your viewers?  If so how much
>are they?

  Sorry no. The only commercial MF stereo viewers
I'm aware of are the King Inn one sold by Que Vue
and the one that comes with some Sputnik cameras.

  I haven't seen either and don't know the lens
FLs

>Thanks from a fellow Saskatchewaner.
>I was born in Yorkton.

  You're welcome Dale. How long did you live
there.

Regards - Greg E.



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