Originally Posted by
sabeluc
Doremus, thanks for the information. This is exactly what I needed to know. I'm happy to have a spare ground glass.
I made a (possibly temporary) cover glass out of the thin glass from a cheap ikea picture frame. Indeed this glass is slightly thicker and more greenish than the ground glass that I took out of its place. But, since I don't have an original cover glass, I don't know the correct thickness for cover glass.
I think that since the cover glass is on the outside (towards photographer) of the fresnel sandwich unit and is clear, it can't change the focal plane. It doesn't move the position of the frosted lexan, it just protects it. Is that right?
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