[rollei_list] Re: Anti Newton Ring Glass Effect on Enlarging
- From: Don Williams <dwilli10@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 28 May 2009 20:49:27 -0500
At 08:00 PM 5/28/2009, Elias wrote:
Hi All,
I think this question is best for all the optics aficionados here:
My enlarger uses AN glass above the neg, and clear glass below. With
my b&w Rollei negs this works very well, but with color negs not
well at all. Even though the emulsion side is in contact with the
clear glass, I still get rings. I'm thinking of getting another
piece of AN glass for below the neg. (emulsion side). Will that have
any effect on the projection, and the resulting print?
Thanks,
Elias
It all depends on the texture of the color neg. My ANR experience is
based on glass mounts for 6X6 projectors, and of course I have tried
all combinations, however color positives are not as smooth as color
negs. I got the best results with ANR glass on both sides,
particularly in theater-size high power projection systems that would
eventually cook the slide.
Why not just get another piece of ANR glass for the
bottom? Alternatively, experiment by exchanging the glasses and
observe the result. You could also just examine what happens when
you put the neg in emulsion up.
I think it will depend on the depth of focus of your enlarger as to
whether the ANR glass distorts the projected image.
Can you see the rings on the paper holder or only on the print?
What happens when you use B&W paper with color negs?
In the olden days a little dusting of corn starch, or something
similar did the trick.
Good luck.
---
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