I bought a Nikkor 50mm f/1.4 AI-s lens the other day on ebay and i got it in the mail this morning. everything about the lens except for one thing looks great focus is smooth, no scratches, dust, fungus, haze in the lens aperature ring snaps nicely. However i was looking at the aperature blades to make sure they were nice and everything appeared fine until f/11. the aperature blades do not appear to move between f/11 and f/16. My question is, is this a cheap fix, or do i send the lens back to the seller. I dont mind spending a little to get this fixed, but anything more then 20 bucks and i might as well send it back and look for a different one.