slow diaphragm?

I have an M 28/2.8 (yes, I know, spare me the "but the 3.5 is much better" comments, I've heard it already) that I picked up used a while ago. Lately, I've been getting really overexposed shots when I use f16 or 22. The slides look up to 3 stops overexposed, and I'm not having the problem wit

How much does it cost to fix a slow diaphragm?

I was offered a 50mm A f/1.4 lens in mint condition, but I noticed that the diaphragm closes slowly. It does not have any oil visible on it, which is the usual cause of slow diaphragms, so I'm concerned that a simple cleaning won't fix it, and it may have a more costly mechanical problem. Doe

Re: How much does it cost to fix a slow diaphragm?

On 4 Aug 2002 at 0:34, Peter Spiro wrote: > I was offered a 50mm A f/1.4 lens in mint condition, but I noticed that the > diaphragm closes slowly. It does not have any oil visible on it, which is the > usual cause of slow diaphragms, so I'm concerned that a simple cleaning won't > fix it, and it

Re: How much does it cost to fix a slow diaphragm?

Anton Browne e-mailed me off list with what seems like a very good suggestion: I had that problem once on a Pentax lens - the lens was tatty but optically fine and I'd got it cheap, it was a common lens so I wasn't too bothered. I set the lens to close focus so it was extended and carefully lubr