Camera Labs

Not good news for Sigma:

http://www.lensrentals.com/news/2008.09 ... sigma-saga

Lens repair data:
http://www.lensrentals.com/news/2008.09 ... ir-data-10

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Canon 7D/350D, Σ17-50/2.8, 18-55IS, 24-105/4 IS, Σ30/1.4, 50/1.8, 55-250IS, 60/2.8, 70-200/4 IS, 85/1.8, 580ex II, 430EX II, 270EX II.

That is interesting. Very shocking find, jitteringjr
After reading this it looks like an authentic report of a real broad sample.
Top 5 spots for Sigma lenses, but Nikon is also up there with some lenses at 10-14% failure rate and the Nikon 70-200/2.8 VR having more than double the failure rate as the Canon equivalent.

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

Moral of the story?

Buy Sony!

(casually ignores the potentially minuscule number of Sony lenses sold)

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PhilipGoh.com

Little late, but...

Just after Christmas, after getting a K20D for Christmas, I went to the mall with the wife+kids, and found a Ritz Camera store. They had a Sigma 2-lens kit (V9945 - 18-50mm F3.5-5.6 DC Lens plus 55-200mm) for Pentax-K mount on clearance at like $149.95, including a carry case. Bought it, took it home, and PFFFT!
Small zoom DOA. Originally, the AF worked, but it wouldn't lock - it just hunted back and forth. Then, the zoom ring froze when mounted on the K20D. Shortly after that, I couldn't see through the viewfinder - pitch black.

Took it back the next day, and the person at the store said the diaphragm was broken, as was the zoom mechanism.

Nice....

Moral of the story - you get what you pay for!

Tony