Originally Posted by
David A. Goldfarb
Is the focusing screen backward? The ground side of the glass should be toward the lens.
Is there a fresnel lens installed? On a Sinar back, the groundglass is usually between the fresnel and the lens, but I don't know that this is the case with all Sinar backs. I think I had one once where the fresnel was under the groundglass, but I don't know if it came that way from Sinar, or if the back was adjusted to be used that way, but it focused properly. If the fresnel is in the wrong position, then the groundglass will be out of register with the film plane.
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