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Go Back   APUG > APUG English Forums > Equipment > Ultra Large Format Cameras and Accessories > 20x24" contact printing frame

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Old 07-15-2008, 03:29 PM   #21 (permalink)
 
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Join Date: Sep 2002
Location: Roswell, Ga. USA
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Right, theres a bleed valve and a vacuum gauge on most, my NuArc has it. You can set the vacuum from full to nothing with a twist of the valve.
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Old 07-31-2008, 12:58 PM   #22 (permalink)
 
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Location: Aurora, OH
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Default Vacuum frame for 20x24

A vacuum frame is a must for 20x24 for any semblance of image quality. Sandy and Nicholas explained it well. For those of you who think a clip or split back frame is OK try placing a 1/2" wide stouffer step wedge across the split or in the middle of a clip frame and expose it onto a piece of coated paper. I think you'll be sorely dissapointed. You'll see very clearly whether the frame is holding the negative and sensitized paper in contact. This is the test I have any student do who brings their own contact frame to a workshop. I've seen very expensive frames fail the test.

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Originally Posted by Falkenberg View Post
Does anyone know about who produces a 20x24" contactprinting frame ?
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