Aperture problem FD 50mm 1.4

[Ceatra]

Hello everybody,

So recently I acquired a Canon A-1 with a 50mm 1.4 (FDn).

 

I started playing around with the aperture, and I noticed that the aperture blades wouldn't change from 11 to 22. The size was always the same, and 1.4 seemed a bit too small. 

 

Any idea what it could be? (And yes, the stop-down lever was engaged)

 

Thanks in advance.

[Thanatopsis]

Have you replaced the battery? Also when you rotate the aptiture ring does it feel sticky or mushy?

 

These are roughly 50+ year old lenses so if you havent taken it in to get serviced it could be dust or mildew affecting its function.