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What could cause this banding?


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Leica IIIa, 50mm Summar, all my photos are showing the horizontal banding you can see on this image. I'm at a loss to know what would cause this particular pattern. I know the shutter curtains need replacing, they leak, but could the curtains also be causing this?

 

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I assume you mean the many fine darker lines aligned with the long axis of the frame. This is typical of "fuzzy" edges of the shutter curtains that form the narrow slit that traverses the frame at high shutter speeds. The slit is very narrow at highest speeds, and such irregularities on the edges are like a saw tooth - reducing exposure where they stick out.

Shots taken at lower speeds shouldn't show them.

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