Yes, thanks!

So is it likely that there is something broken which will need replacing and not just something that has come loose? Steve's photo makes me think that maybe I'd be better off trying to get ahold of a broken A lens before even opening this one up...

Thanks Steve! My problem is clearly number 2 -- good to figure out before taking the lens apart to the those infamous plastic welds and discovering that they're both still intact!

Comparing this lens to another lens with the A position (Sigma 28-200), I notice that the little button on this lens is distinctly "floppy" -- I can tap it down with no resistance at any aperture. On the Sigma, it goes down on its own and stays down through the whole range, and just pops back up again at f22. This could be a design difference between the brands, but it seems more likely that it's a problem with the 50mm.

Steve, I don't see a ball ended contact protruding through the lens mount. I was just about to ask you what you meant by this, but I actually do see it quite clearly in the first photo from the set we've been looking at on this thread -- so that may be what's come loose on mine? The hole there is just empty!

Yes, thanks! Those photos are significantly less scary than the diagram!

So are those tangs that we see him re-attaching in the photos actually parts X27 and 28 from the diagram?

I am pretty mechanically minded, but I must admit that I find that diagram a bit daunting!

So I would basically open up the back of the lens as far as the aperture ring, find part X510 which is probably floating around loose in there, and superglue it back onto the ring?

Edumad -- is your caution to be careful about losing the small parts? Or that they're difficult to get into place because of the size?

Thanks!

Yes, it does rattle... that's probably a bad sign

Any idea if this sort of thing is repairable, or would it cost me more than the lens is worth?

Hi,

I recently picked up an ME Super, partially because I wanted to play with film and partially because it came with an A-50mm lens and I was planning to swap it for the M-50mm I currently use with my K20D. It turns out that while the aperture ring will turn to the A setting (on both cameras) if you push down the little button, it doesn't stay there. The button doesn't pop back up to lock it into A mode like on other lenses, and the K20D doesn't recognise it as being in A mode.

Is this normal? Am I missing some trick? Or is there something wrong with the lens?

Thanks!