P3D Re: image difference

[koganlee@xxxxxxxxxxxxx]

On 01/14/99 21:08:02 you wrote:
>
>When I print b&w pairs from my Revere or Realist, one seems a little
>darker than the other.  It doesn't really affect the viewing.  Is this
>normal?  Are the aperatures out of sync?
>
>Jeremy
>
>
>
>
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Jeremy (and others who may be interested),

As a b&w stereo card printer I will give my perspective on this. Yes, the apertures are probably a little out of sync. With slides this tends 
not to be too noticeable (if it's slight) primarily because 1) you don't generally see them side by side outside of the stereoscope, as you do 
with stereo cards, and 2) while slides have less lattitude than negatives, prints have the least lattitude of all, so a very slight difference 
in exposure is noticeable. This is my biggest headache in making large prints. I can slave for hours on a pair of prints, and there will often 
be a slight but noticeable difference between the 2. No matter how well matched the apertures and shutter speeds are there will often be 
slight differences in exposure and you will almost always have to vary the exposure between the 2 in printing.

In a similar vein, this reminds me that I discovered the hard way that an aperture (say f11) will be one size if you get to it by stopping 
down, and another size if you get to it from the opposited direction. Only a stereo photographer could discover this. (Obviously this is not a 
probablem with stereo cameras.)

David Lee


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