do I need to get mad at myself again?

[stimpy52]

My industar 61 at f5.6. A little more pronounced at smaller apertures, less so as you get closer to wide open. Do I have one malcontent aperture blade here or some kind of generalized insurgency requiring extreme use of force?

 

[bsdunek]

Just a guess, but I think one of the aperature blades has slipped off one of the pins. It's kind of 'going along for the ride'.
Looks like time for a CLA. 😎

 

[misok]

hi,

absence itself won't do much harm imho (maybe a very slight exposure shift), but a loosen blade could potentially damage others and/or scratch the glass..