"I trust their judgement and when they told me that they were junk"
Sorry Michael, I just spoke to Martin at Marflex and he says he did not and his employees did not say they are "junk" this is not a word that they use for equipment they service.
And to quote him further he states that Marflex can shim the screen to eliminate problems.
Thousands of the Super Screens have been sold over the 20 odd years that we have offerd them. Yes there was a problem with warping on early ones. The second and later batches were made from a thicker material with a higher heat tolerance. But it is still plastic, unsupported, except at the extreme ends of the screen. For use in areas where warping may be a problem we recommend that shims be placed along the sides.
If this is inconvenient the latest version of the Linhof ground glass and the latest fresnel screen are substantially brighter then older ones. Of course, with Linhof, "older ones" is an uncertain amount as they have been making cameras for so long a period. But if your current Linhof screen and fresnel is 10 or more years old a newer one will be benificial.
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