I have a Durst enlarger that I use to blow up my negatives. I have taken off th e glass from the tray because pushing on the film it gave on the print the Newto n rings. After I cleaned very well the glass two o three times but it still gave me the same problem. Now I'm printing without it: for the small format I haven' t problems, but for the medium format the negative bends itself going out of foc us. I read about this on my Ansel Adams book "The Negative" but it dosen't give an exhaustive explanation. Please have anyone a good way to solve this trouble? Thanks
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