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Old Oct 22, 2008, 11:53 AM   #1
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http://www.lensrentals.com/news/2008...the-sigma-saga

To be fair my (now gone) 70-200 2.8 (non dg, non macro) and 120-300 2.8 (again non-dg) never had problems. But I have seen threads from reliable sports and wildlife shooters indicating QC problems.
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Old Oct 22, 2008, 12:03 PM   #2
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Interesting. I only own one Sigma (a Sigma 35-70mm f/3.5-4.5 "Zoom Master" in Nikon mount), and it's got stripped autofocus gears in it. ;-)

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Old Oct 22, 2008, 12:06 PM   #3
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But, in fairness, it was used pretty heavily for years before it developed any issues.
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Old Oct 22, 2008, 10:06 PM   #4
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I own several Sigma lens and have had zero problems with them. The Bigma 50-500mm is on my K10D almost all the time and I've shot 20-30 thousand photos with it with no problems. Still zooms and focuses fine.

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Old Oct 23, 2008, 8:27 AM   #5
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I guess you can still buy a few sigmas and never have a problem in your life. but the idea of having even a 1 in 10 chance that you'll get a bad copy - I've seen several reports of people only getting a good copy after the 2nd replacement, here in this forum - is enough to push me away from sigma. the last thing I want to do when I get a new toy is to spend a few hours checking if it isn't a dud.

though the reviews I've seen of the da*16-50, at least of the first few batches, are just as scary. there's a post at dpreview (I'll edit this with a link later) comparing a tamron 17-50 shot at 2.8 against a pentax 16-50 at 5.6 (obviously a bad copy) that is just appalling.
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Old Oct 23, 2008, 10:25 PM   #6
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A later post contans more detail.

See http://www.lensrentals.com/news/2008.09.20/lens-repair-data-10
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Old Oct 24, 2008, 12:21 AM   #7
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I can't speak for anyone else's problems with Sigma lenses but I have owned several of them: 18-50mm f/2.8, 28mm f/1.8, 28-200mm, 70-200 f/2.8 (non-HSM...stolen in Hawaii), 70-200 f/2.8 (new HSM lens), 50-500mm.

Nary a problem in the bunch.

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Old Oct 24, 2008, 5:41 AM   #8
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I own several Sigmas and feel they represent good value for money, not the best lernses, but not the most expensive either.

In the second link, lens rental say most of their failures occur during shipping - not use. So if you buy a lens locally and don't ship it around the country regularly then Sigmas still represent a reliable lens.

Interestingly near the top of the list of fault areas looks to be the Optical Stabilization system (OS) -:blah: since this is not applicable to newer Pentax DSLRs with sensor shift shake reduction that cuts out a lot of faults.


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Old Oct 30, 2008, 9:04 AM   #9
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In their experience, the Sigma 120-300/2.8, 120-400 OS, 150-500 OS, 50-500, and 100-300/4 do seem to have extraordinarily high failure rates.

What I find most distressing is this:

"One third of the Sigma 150-500 and 120-400 lenses we bought were defective out of the box and had to be exchanged. Several more broke during their first and second rentals. New copies of other Sigma lenses showed up with high defective rates out of the box. Repairs have become even slower and now even our routine in-warranty repairs are being refused and billed as ‘customer damage', even though we've never rented them out, simply tested them."

That's unacceptable.
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Old Nov 2, 2008, 10:57 PM   #10
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That is sad to hear. I have about 6 Sigma lens for the Pentax mount, 3 high end EX series lens and 3 other cheapo sigma lens. Non of my lenses where listed in that link.

Out of my 6 Sigma lens, I would say only one is bad and that is the cheapo 100-300mm lens that I bought used for about $80 or so. It still takes great picture, just the zoom is very loose. But I really can't complain, the lens is old. The other 5 sigma that I have are great.

I still believe that sigma have some of the best zoom lens for the money and I would still buy sigma zoom lens in the future.



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