Pictures of a solution to Newton rings with the Leitz Focomat Ic and Valoy II
I got these black pvc sheets at the office supplies store. Very thin stuff, like not even half a millimeter.
For those unfamilar with the Focomat Ic and Valoy II: this is the negative holder that slides into the lens stage and fixes itself. One positions the negative strip on top, then you lower the condenser to land on top of the negative. This presses the negative flat. And it is why Leitz made a AN glass that slips on to the condenser. For the early Valoy II enlargers Leitz made a brass ring, with a cut-out the size of the negative, which you could slide over the condenser. The later Valoy II versions came with the glass of the condenser AN treated.
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