I have a Caltar 90mm, f6.8-45 in a Cambo mount for Calumet NX monorail. I cannot get it to focus. Whether up close, 4 feet say, or focussing at a distan t object, 25 feet say, the image remains fuzzy. The effect reminds me of unfocussed images in a microfilm reading machine, when the film has not been spooled correctly between the glass-sandwich guides. Can anyone suggest what might be amiss?
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