There seems to be an issue with a few sigma lenses and the AF on them .
I've only found out as my new 120 - 400 comes within the problem serial numbers . I've not had any problems but i've only used it a couple of times .
I tempted to contact them to see where I stand if something happens in the future out of warrenty if I don't send it back for checking .
FYO
Auto focusing issue affects limited number of Sigma telezoom lenses
After thorough investigation, we have ascertained that some APO 50-500mm F4.5-6.3 DG OS HSM, APO 120-400mm F4.5-5.6 DG OS HSM and APO 150-500mm F5-6.3 DG OS HSM lenses, produced recently, may have a potential autofocus defect.
This issue could possibly occur in some lenses within the following range of serial numbers:
--- APO 50-500mm F4.5-6.3 DG OS HSM
--- Serial Numbers between 10633051 and 10972000
--- APO 120-400mm F4.5-5.6 DG OS HSM
--- Serial Numbers between 10574001 and 10972000
--- APO 150-500mm F5-6.3 DG OS HSM
--- Serial Numbers between 10674301 and 10972000
This is a limited problem that will not occur in any lenses other than those specifically listed above.
To overcome this issue, we are offering our customers an inspection and where applicable, a modification service, free of charge. In the case of any autofocus problem becoming apparent on inspection, we will rectify the situation and make every effort to minimise delay and inconvenience.
link to full page for full details
http://www.sigma-imaging-uk.com/returns/
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I think there are extensive problems with older Sigma lenses not working on modern cameras - Sigma warned me to be careful about anything over 3 years although they did offer to check serial numbers prior to purchase. The lens you received has a serial number which has not been issued by Sigma’s factory in Japan. It appears that the lens you received is a “Grey Market” lens, and has been tampered with having its serial number changed. This would explain why you received no factory warranty card with the lens; the serial.
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Thread started 24 Sep 2010 (Friday) 22:29
picardpicard 1,996 posts Likes: 1 Joined Jan 2006 Location: Canada | Is sigma serial number imprinted on the lens ? Canon 1DM4,7D, Rebel XT LOG IN TO REPLY |
Evan IdlerEvan Idler 1,600 posts Likes: 4 Joined May 2005 Location: Edmonton, Alberta, Canada | All my Sigmas have them on the bottom of the lens, by the camera mount. Canon5DIII + Some L + Some non L + Some Sigma + Some Tamron + other stuff.... LOG IN TO REPLY |
msowsunmsowsun 9,282 posts Gallery: 18 photos Best ofs: 1 Likes: 382 Joined Jul 2007 Location: Oakville Ont. Canada | Here is a photo of a Sigma 17-70 I used to own. The Serial number is actually a sticker. Mine was coming off so I glued it back in place. Maybe yours has fallen off too? Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II LOG IN TO REPLY |
Sigma Serial Numbers Lens Canon
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Sigma Lens Warranty