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Is it possible that a camera body could cause slow aperture blades, not the lens?
Yeah, sure.
See the little thing on the lens (A) which closes the aperture blades is moved by the little thingee in the camera (B) so in other words if (B) is sticky (A) won't move quickly /smoothly!
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As @supersalad expertly demonstrated, it could be either. Should be easy to find out which one though by working the levers manually, both should snap back instantly. Should be a fair bit of resistance on the body lever also.
I'd still guess at it being gunk on the aperture blades in the lens causing problems, with perhaps the MV body lever having a bit more snap on stop down.
salad
Ste_S
@Turkish
Is it possible that a camera body could cause slow aperture blades, not the lens? Got an ME Super and the aperture blades are super slow to close down on dry firing, but seems to be fine on my MV body. Real shame if this is the case as the viewfinder is super clean