Originally Posted by
Doremus Scudder
The Wista Fresnel/ground glass is more than just a Fresnel lens. Every Wista Fresnel screen I know of is a sandwich of ground glass (acrylic, actually), frosted on one side with a Fresnel lens affixed to the viewing side. It is meant to replace the ground glass, not be added to an existing one. If your Calumet came with just a plain ground glass, and the Wista screen is the right size, you should just remove the original one and replace it with the Wista screen, frosted side facing the lens. Then you should be able to focus without a problem.
Best,
Doremus
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