[photo-3d] Re: Realist red button viewer (the good and the bad)

["John Goodman" <jgood@xxxxxxxx>]

Dr. George A. Themelis wrote:

> In my (extensive - hundreds of viewers examined) experience,
> the difference is mainly a matter of contrast and not
> optical qualities like peripheral clarity or flatness of
> field. 

I can't argue with the good Doctor, but with "ordinary" Realist 
viewer cemented doublet lenses, my eyes simply can't focus on 
details beyond a ~5p circular zone of sharpness, unless I adjust 
the viewer focus when looking at different areas of slides 
(which I'd rather not do). The OEM replacement 47mm or 
44mm Wollensak or Revere lenses I have show the same 
limitations.

Otoh, the "black" red-button (black plastic focus knob, black 
switch button) that I bought from DrT ($185 a couple of years 
ago) let's me clearly see into even 7p corners with relative ease 
and no refocusing. A mint "black" red-button I got on eBay 
($200) offers similar performance after widening, works nicely 
with 7p views.

Peter Abrahams wrote:

> To see how good a stereo viewer could be at high cost, check
> out an modern, expensive 35mm slide viewer -- they are
> absolutely sharp across the field, with very little or no
> distortion, and have decent eye relief. 

Could you provide a few maker and model recommendations?

jeg

 

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