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

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On 250mm onwards the auto and manual focus do not work correctly unless I support the front of the lens

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That is some heavy glass.. it sounds like there is a problem with the drive mechanism in the lens when the lens is extended. The droop from the weight of the glass prevents the mechanism to function as designed.

Since this is a precision optic, I would send it to Sigma or other reputable shop for a repair estimate. Attempting to disassemble this or contaminating interior parts would worry me too much for me to try it. Unless you know what you're looking for - I'd arrange for service by calling (1-800-896-6858) or contacting Sigma Customer Support, package it up and send it out for repair. You might still be under warranty, too.

Good luck!

Posted on Mar 23, 2011

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Posted on Jan 02, 2017

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Hi Steph Johnson,
Numerous things could be the issue. 1, dirty lens, clean the front and back element, 2. The camera focus is not working properly not focusing on the correct spot. So, are you manual focusing or auto focusing? If it is auto then there could be an issue with that. If your are manual focusing are you sure your diopter setting is correct for your eyes, if not then it may appear correct in the viewfinder, yet be off focus.

Do you have a way to check the lens on a DSLR? If so you can try that lens on the DSLR seeing if there is an error with the lens or if it is your film camera.

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As long as you can get the correct Tamron Adaptall 2 mounting for it, then it will fit. They're no longer made and not always easy to obtain at reasonable prices.

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1 Answer

Auto focus problem


My first suggestion is to send it back if it is under warranty.

The grease probably got so thick, from the cold, that it caused too much resistance for the auto-focusing mechanism. You probably have damaged the focusing mechanism in the lens. You cannot repair this, yourself. I don't know how cold is too cold but it really shouldn't have done that.... Tamron makes cheap lenses. Try and exchange it for at least a Sigma.

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