I used to love this lens ...
February 14, 2011 12:06 PM Subscribe
My Sigma camera lens stopped working - what's causing it and what can I do?
posted by komara to technology (10 answers total) 1 user marked this as a favorite
I bought a Sigma 15-30mm f/3.5-4.5 (Canon mount) used in excellent condition in April of 2008 from a reputable online retailer. I use it on a Canon 5D Mk I body. I have never had any problems with it until yesterday.
I took a picture with the lens zoomed out to 30mm. The camera made a strange noise - basically it sounded as if the mirror flipped up and then back down correctly but something after that point didn't do what it was supposed to do. Sorry to be vague but the whole operation takes place in well under a second - it's hard to nail down the specifics. Anyway, I looked at the display on top of the 5D and saw "ERR 01". I turned the camera off, popped the battery out and back in, turned the camera back on, and everything was fine. I tried to take another picture at 30mm and got the same results - a slightly strange noise and "ERR 01". At 15mm, though, I was not getting this error.
I didn't have much time to experiment yesterday so I just put another lens or two (both Canon prime lenses) on the camera and had no issues, leading me to believe it's just the Sigma. Today when I had time I took some pics with the Sigma and not only did it start giving "ERR 01" on every shot, but I started seeing something that looks like some sort of film or filter darkening the image I see through the viewfinder.
When I look through the viewfinder it's darker than it should be, and when I take a photo the image recorded to the card (before the camera shuts down with the error) is over-exposed. The dark film / filter would go away occasionally when I turned the camera off and back on. Now it's permanently stuck in the way. When this occlusion of whatever it is is happening the lens can't seem to auto-focus.
I have put other lenses on the camera and all is still well. When I put the Sigma back on the camera it's still darker than it should be, whether or not the camera is on.
Hopefully that's enough information to help you help me understand what's going on. I typically only shoot with prime lenses, so I can't really imagine what's going on inside my only zoom lens to make it act up like this. I'm not expecting to hear good things like, "Oh, that's a $10 fix" so if you think it's dead I'm ready to hear it.