[photo-3d] Re: Medium Format Viewer

["Alan Lewis" <3-d@xxxxxxxx>]

Don wrote:
>Mr alan Lewis stated that viewer lenses are "the bigger in diameter the
>better " but my experience is to the contrary and that bigger is a cheap
>substitute for having control of the interocular spacing - pass  a 35 mm
>viewer around and watch the different viewers make interocular adjustments-
>when available which is a given with most 35 mm viewers. DON

Bigger lenses are more expensive than interoculuar adj., not a cheap alternative.
I use bigger lenses first for the field of view.
If a standard infinity spacing (mounting gauge) is followed when mounting slides there is no need for interocular lens spacing in a viewer.  A larger lens diameter allows comfortable viewing for people with various eye spacing without the necessity of fiddling with interocular adjustments.
If a viewer lens centerline is always slightly greater than the maximum infinity spacing on a slide then interocular viewing adj. is not necessary.

If one mounts slides without a standard infinity spacing then adj. interocular may be necessary.


Alan Lewis
3-d@xxxxxxxx
Serious viewers for serious Viewers
http://members.home.net/3-d


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