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View Full Version : Opaque glass filter to minimize Callier effect?



Gregory Bell
18-Nov-1998, 17:29
The only enlarger I have access to is a Beseler 4x5 with a condenser head. I've read about the Callier effect, and I'm wondering if it can be minimized by usin g under-the-lens filters for multicontrast printing, and making a "filter" of op aque class or other material for the filter drawer. Will this work? Any disadv antages? Many thanks for your input.

Alan Gibson
19-Nov-1998, 06:25
The Callier effect is caused by the negative being lit by directional light. If you put opaque glass between the light and the negative, it won't be illuminated at all. Perhaps you mean opal glass, or other diffuse material. This will difuse the light, and reduce the Callier effect. I have used this method on a De Vere 54.

Gregory Bell
19-Nov-1998, 21:54
I've proven myself "opaque" in the newer sense: hard to understand. I did, indeed, mean to ask about using frosted glass or something similar. Thanks for your feedback -- other opinions would be appreciated as well.