A friend of mine bought a used Fuji SWD 5,6 / 90mm lens ( serial n? 570...) and mounted it on either a Sinar F1 or an Arca Discovery. The images made with the t wo cameras at f:22 and infinity are sharp on the 4/5 part of the film but are un sharp along a linear vertical strip at the left side. This problem can be seen o n the ground glass of both cameras, so I do not think it comes from the camera i tself nor from the fidelity holders ( the Arca is new and so the Fidelity's). Co uld this problem come from the lens? There is no washer between the two parts of the lens but the front part of the lens is mounted on the lensboard with two th in washers in between. Is it a proper way of mounting this lens? Can someone exp lain?
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