Question about Sigma APO 50-500mm F4-6.3 EX DG/HSM Lens

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Bigma 50/500 as i rotate the the zoom ring it gets grit like and is hard to turn and it is removing paint from the inner tube feels like a rock is under the ring any thing i can do to fix this with out taking it apart like some shim stock to see if i can get the rock

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Hey Bob G,
I would try blowing compressed air into the lens to try and dislodge whatever is stuck in the lens barrel. If this doesn't work I would advise you to not take the lens apart. Camera lenses require precise mechanical alignment that can only be achieved with the right tools and the education necessary for achieving it. It would probably be easy to take it apart, but very hard to put it back together. You could try a shim, but you run the risk of damaging the lens further. I hope this helps!

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Posted on Jun 25, 2008

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Hi Bob I have the same problem I think. Is there play between the back and front of your housing. I think Sigma should have put more support on the front end of that lens. I drilled a hole thru the mount and tapped the hole to but a bolt in order to take tension off the focus ring and it worked. I know this didn't solve the real problem but the lens is working fine. I bought the lens used and didn't get the original receipt therefore coudn't get the warranty so you do what you have to do. If you need a picture of the modification send me your e-mail.


Posted on Sep 13, 2009


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