I have a used 90mm Grandagon f/6.8 that I purchased a couple of years ago. The lens is multi coated and the glass looks very clean. Everything I've read on this lens says it should be very sharp but it doesn't compare to my 75mm Nikkor or 58mm SA. Could something be wrong with the lens mounting or could there be something else that is causing this lens to be less than it should be and can it be fixed?
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