farlymac
PF McFarland
When I got my 1951 Summitar 50/2 the aperture would go from very loose to very stiff and back again. Didn't seem to matter what I did with it, even loosening up the optical block a bit to see if it was binding there.
Eventually I took the block out to get a look at the workings of the aperture and saw something I'd never experienced before. The aperture blades form a dome when at f16.
Anyway, they are extremely stiff now, and I'm worried something might be bent. I don't see any spacing issues such as you would expect if one of the blades were broken. I'm a little reticent to take the retainer out as I don't want them to go flying.
Any word on what could be causing this binding issue? It can't be the retainer because the set screws have it firmly locked, and the aperture started out as being loose.
PF
Eventually I took the block out to get a look at the workings of the aperture and saw something I'd never experienced before. The aperture blades form a dome when at f16.
Anyway, they are extremely stiff now, and I'm worried something might be bent. I don't see any spacing issues such as you would expect if one of the blades were broken. I'm a little reticent to take the retainer out as I don't want them to go flying.
Any word on what could be causing this binding issue? It can't be the retainer because the set screws have it firmly locked, and the aperture started out as being loose.
PF
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