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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 01 Jan 2008 (Tuesday) 19:25
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Faulty Sigma 10-20mm?

 
Zwiz
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Jan 01, 2008 19:25 |  #1

Hello,

I've had the Sigma 10-20mm for a few months now. Some of the images are incredibly sharp but sometimes, the left side is really bad. It's not easy to pinpoint the problem since it is intermittent. It will rarely show at 10mm or when the image is oriented vertically! But from 12mm to 20mm, I would say 1 image out of 3 has the left side out of focus.

Here an image here that demonstrate the problem.
Please, tell me what you think!

Sigma 10-20mm at 12mm, f/8, 1/400sec, ISO 200, on tripod.
Full image (no crop, resize 33%):

IMAGE: http://img185.imageshack.us/img185/7920/3673tierpn5.jpg

Cropped image (100%): looking at the streets name, you can see the exact point where the lens begins to show focus problem:
IMAGE: http://img185.imageshack.us/img185/328/3673cropmp2.jpg

XT/XTi/40D, 10-22mm, 300mm f/4L IS, 100-400mm L IS, 430EX II.
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tekkie
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Jan 01, 2008 19:29 |  #2

thats really weird, I think your lens is messed up :(


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TeamSpeed
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Jan 01, 2008 19:39 |  #3

I would call Sigma and send that in. It appears a lens is off axis just a bit inside.

Here is a thought, there aren't any smudges on the back end of the lens (side that connects to the body), are there?. The closer a smudge or any dust/dirt to the sensor, the more impact it will have on the photos.


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Tee ­ Why
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Jan 02, 2008 00:20 |  #4

Looks like the focus is on the ladder on the right.
Try some controlled testing. It is was due to a lens defect, I'd expect to see it in all the shots so I'd suspect user error over lens defect.


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azpix
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Jan 02, 2008 00:25 |  #5

Tee Why wrote in post #4612460 (external link)
Looks like the focus is on the ladder on the right.
Try some controlled testing. It is was due to a lens defect, I'd expect to see it in all the shots so I'd suspect user error over lens defect.


i concur with the above.

do you have more photos with the lens?


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MagentaJoe
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Jan 02, 2008 00:47 |  #6

This appears to me to be a decentered element or two. As they move this will change the way the light path is transfered from one element to the next. Depending upon how zoomed and where the focus is the effect will vary. Just a guess...


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form
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Jan 02, 2008 03:21 |  #7

I had a decentered element in a sigma 10-20 before; I got it replaced with a slightly less center-sharp lens, but one with no decentering issues.


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Zwiz
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Jan 02, 2008 10:14 as a reply to  @ form's post |  #8

Thx for the answers!

So, it could be a decentered element... Ok, I'm getting my screwdriver and my ruler right away and I'm going to do do a job on this lens. More seriously, this lens is going to Sigma. "Form", did Sigma replace or repaired your lens?

Here another one, again at f/8 on tripod. Note: this is a test image, nothing artistic about it!

Full, resized to 33%

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'


Crop 100% Left side
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'


Crop 100% right side
IMAGE: http://img530.imageshack.us/img530/8974/3689rightpo0.jpg

XT/XTi/40D, 10-22mm, 300mm f/4L IS, 100-400mm L IS, 430EX II.
Gallery: http://picasaweb.googl​e.com/blubOmatic (external link)

  
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kevin_c
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Jan 02, 2008 10:23 |  #9

I think this was/is a common problem with this lens. I'd be sending it in for repair.


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form
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Jan 02, 2008 11:01 |  #10

Neither; Sigma accused me of getting a grey market lens (serial number discrepancy), and said "send it in and we MIGHT consider repairing it under warranty," but the original reseller was willing to replace it.

As far as I understand, this is not necessarily the standard treatment from Sigma, but it still soured me towards them.


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Tony-S
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Jan 02, 2008 11:12 |  #11

form wrote in post #4614639 (external link)
Neither; Sigma accused me of getting a grey market lens (serial number discrepancy), and said "send it in and we MIGHT consider repairing it under warranty," but the original reseller was willing to replace it.

As far as I understand, this is not necessarily the standard treatment from Sigma, but it still soured me towards them.

Sigma USA won't repair grey market lenses as they are not responsible for them. The greys also come with a 1 year warranty from Sigma Japan (requiring sending the lens to Japan), while the Sigma USA EX lenses come with 4 year warranties for repair in the USA.


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form
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Jan 02, 2008 11:40 |  #12

The seller was verified and genuine, and it was NOT marketed as grey market. If it was a grey market lens, then the head of the company lied to me directly (I spoke with him).


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Tony-S
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Jan 02, 2008 11:55 |  #13

That's a bummer. I always buy my EX lenses from B&H since they only get theirs from Sigma USA. That way, all I need is the receipt that shows B&H's logo to verify it's legit. I get my non-EX Sigmas from Sigma4Less, which are usually grey market and only have the 1 year warranty anyway.

I hope you got your problem resolved satisfactorily.


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Tee ­ Why
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Jan 02, 2008 13:08 |  #14

The image looks slightly tilted down and not perfectly aligned, but to me, it does look more like misaligned lens/optics.

I'd send it into Sigma.


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KnightRT
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Jan 02, 2008 19:38 as a reply to  @ Tee Why's post |  #15

I had four of these lenses that looked exactly like yours. All were decentered, and three were Amazon RMA replacements. The last, I sent to Sigma. It came back significantly worse than how I sent it.

I gave up and bought a 10-22, despite the fact that I think the 10-20 is at least as good. One hopes you'll have better luck.




  
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Faulty Sigma 10-20mm?
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