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i recently bought some etone shutter curtain to replace the old ones in my zorki3.
I noticed because the etone curtains are only 0.15mm at speed 1/1000 the curtain dosent create a gap, i had to make the drum thicker by adding extra curtain material.
now the gap for 1/1000 at the begin of the travel is about ~1,2mm and at the end ~3,4mm.

So im looking for a better source for zorki curtains since the last post discussing is already over a decade old.