I have a beat-up Crown Graphic that I removed the fresnel screen from. In addition to being well scratched, I also did not care for seeing the ridges when focusing through a loupe.
My solution to shim the ground glass to the right depth was to cut thin strips of masking tape and layer them up. But I'm not getting uniform depth using this method, not to mention it's ugly.
Is there a better way? I need approx. 1.1mm of shim to get to a total 5mm depth.
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