Re: Stereo Card Specifications

[bercov@xxxxxxxxxx (John Bercovitz)]

I don't know stereo card specifications but you're right when you say:
> Meaning, an image captured on  35mm film with a 50mm focal
> length lens should be viewed with a 50mm focal length eyepiece, therefore an
> image scaled up to 3 times its original size should be viewed with an
> eyepiece that is 150mm focal length.

The maximum allowable on-film deviation also scales.  If the focal length
of the card viewer's lenses is 150 or 175 mm, then the maximum allowable on-
film deviation will be 150/30 or 175/30 mm but you can get away with slightly
more.

John B


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