tomasz_dzurak

Definitely clean contacts. They do get dirty, and this is easy to clean them. You may see Err 01 for any lens. If lens is otherwise good, cleaning with soft cloth works every the time.

Thanks, I agree it is not worth sending for repair. It's not my favorite focal length anyway, so I manage without 50mm for now. On the other hand I can use it as an excellent loupe, which I will do.

I did. I tried it on my old film body. Behavior is the same - this lens acts up as above, and other lenses work fine. This lens autofocuses fine, but you cannot take a shot with it. After cleaning contacts really hard, it will take one or two shots, and the lens grinds loudly before generating error 01. While it grinds, I see aperture fails to close completely. It starts to close and then reopens and again. Looks like aperture motor is bad, or maybe some mechanical fault. Thank you all for replaying to this.

It is just this lens. All other work fine. If I clean contacts really hard it works for shot or the, but then stops, now generating some noise. Thanks.

Thanks for replay. All over lenses, and everything else work fine. It is just this lens.

I just used cotton cloth. I will try cleaner. Thanks.

Recently my 50/1.4 lens causes Err 01 consistently. This is communication error, the exit error message is this (just for the record: "Communication between the camera and lens is faulty. Clean the lens contacts." This happens from time to time with every lens, and cleaning contacts normally helps. The same for this one. But recently the lens became unusable. It autofocuses fine, but press the release, and I get this message. Contacts on the lens look fine, they show some wear, lens is dated 2003 or so. Cleaning sometimes helps, but after only one or two shots its errors again. I just wonder if anyone came across problem like this? Other lenses on this body work fine. I didn't see tis error in years, until recently.