Re: PHOTO-3D digest 2391

[P3D Eric J Fleischer, MD <gandalf@xxxxxxxxxxxxxxxx>]

On Sat, 8 Nov 1997 11:58:43 -0600, Mark J. Shields
<northws1@xxxxxxxxxxxxx> wrote:

>The Pentax has
>rear mirrors that are thicker and/or not beveled so much, so it
>makes a dark band in the center (which still shows up on one edge
>of each image). Since the Pentax has bigger front mirrors, it does
>not have the edge darkness problem that the Stereo-tach does, but
>it does have the problem in the center. So whichever one I use,
>I do not have a clear image all the way across. This is with a
>50mm f/1.8 Olympus lens on an OM-10. The 40mm f/2 does not work
>well with either beamsplitter--there are strange image bands along
>both edges of the slide.

   I also have the Pentax, and I only get a dark band down the middle
of the picture if I use an f/stop smaller than f/8. If you use a
bigger stop than f/5.6, the two images will overlap at the center.
Pentax recommends using a 50-55mm lens at either f/5.6 or f/8.=20


<ELF> - Dr Gandalf - Eric J Fleischer, MD
AlfHeim Imaging
gandalf@xxxxxxxxxxxxxxxx


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