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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 05 Feb 2018 (Monday) 08:25
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Sigma focus issues and their customer service

 
sploo
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Feb 06, 2018 02:30 |  #16

With adequate light you should be able to do an indoor test; though it is better if you can utilise daylight through a window as it tends to be much stronger than indoor lighting.

Assuming you haven't already, try your tripod based focusing test using Liveview. Although the Liveview AF on the 5D4 is also phase based (like through the viewfinder) the AF is performed "on sensor" so MFA calibration isn't an issue. If that's failing repeatedly then I would suggest the lens was defective.

However, if that works, but AF through the viewfinder is unreliable, then look into using Sigma's USB dock.

I have the 35A (and a 5D4) and found that I could MFA it for one focus distance, but that it was unreliable at other distances. I went through the DotTune method with the lens mounted on the camera, and the sensor plane-to-target distance at the four different distances that can be calibrated using Sigma's Optimization Pro software. For each distance I found the camera's MFA value that got me the best focus.

Although Canon's internal MFA values don't necessarily correspond to Sigma's, I found the MFA values I got from DotTune to be pretty close (it only took a couple of repeated test cycles to nail it down). Now the lens pretty much never misses - even wide open.


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shaunmcfd
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Feb 06, 2018 10:04 |  #17

**Update**

I spoke with a supervisor this morning who also stated I needed to send my camera and lens for a calibration to make a final decision. After telling him I had a wedding coming up on the 17th he offered to send me a prepaid overnight shipping label and will then ship it back overnight so I will be sending in my camera and lens to be calibrated together. I;m very appreciative of them handling this like they have and just hope this fixes it or determines it's a faulty lens. I'll update next week when I get them both back.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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umphotography
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Feb 06, 2018 12:19 |  #18

shaunmcfd wrote in post #18557644 (external link)
**Update**

I spoke with a supervisor this morning who also stated I needed to send my camera and lens for a calibration to make a final decision. After telling him I had a wedding coming up on the 17th he offered to send me a prepaid overnight shipping label and will then ship it back overnight so I will be sending in my camera and lens to be calibrated together. I;m very appreciative of them handling this like they have and just hope this fixes it or determines it's a faulty lens. I'll update next week when I get them both back.


Yup this is what they do when you get management involved. For the record. I bet they get it dead bang on the $$. Seen this a few times over the years

keep everyone posted


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shaunmcfd
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Feb 06, 2018 12:25 as a reply to  @ umphotography's post |  #19

He also told me that since I bought the lens through B&H it had a 4 year warranty instead of just 1. I guess I overlooked that part.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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shaunmcfd
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Feb 08, 2018 14:14 |  #20

*2/8/18 update*

Supervisor just called me and stated that they have calibrated lens to my body and confirmed inconsistencies with autofocus. He said they tried another lens which was a little better but bad enough to call it inconsistent as well. Apparently they will go through lenses until they find one with no inconsistencies.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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cristphoto
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Feb 08, 2018 16:20 as a reply to  @ shaunmcfd's post |  #21

No offense but this is a good reason to stick with Canon lenses. I have heard too many quality issues with the Sigma lenses. At least the manager is working with you to try to resolve the af issue.


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shaunmcfd
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Feb 08, 2018 16:31 as a reply to  @ cristphoto's post |  #22

If I had it to do over I would have bought the 35 1.4 ii and been done with it. The extra money would have been worth not having to go through this headache.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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rantercsr
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Feb 08, 2018 20:10 |  #23

I have a sigma 18-35 for about a month.. a couple of test shots seems ok.. but havemt really used it enough to know .

I've stayed away from sigma lenses mostly becaue of this kind of thing .
I had the 18-35 before a few years ago.. I'm sure it focusing issues .I returned it .
Got it again now for my 80d in hopes that it will work out as i do really like the IQ this lens produces..
Was even thinking to send it in with camera to get calibrated , assuming they would do the best job ..

But yeah if canon made a 18-35 1.8 zoom i would have bought even if it cost a bit more


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umphotography
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Feb 08, 2018 21:01 |  #24

shaunmcfd wrote in post #18559462 (external link)
*2/8/18 update*

Supervisor just called me and stated that they have calibrated lens to my body and confirmed inconsistencies with autofocus. He said they tried another lens which was a little better but bad enough to call it inconsistent as well. Apparently they will go through lenses until they find one with no inconsistencies.


WOW !!!!!

That is disappointing


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shaunmcfd
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Feb 08, 2018 21:06 as a reply to  @ umphotography's post |  #25

It is but I honestly don’t know what else they would besides refunding my Money. Since I bought it through B&H I’m not sure how that would work. At this point I would gladly accept a refund. I’m disappointed to say the least.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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shaunmcfd
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Feb 10, 2018 11:03 |  #26

*update 2/10/2018*

Spoke with supervisor again who stated they are going to replace my lens as they have deemed it defective. He also said the second lens was better but not 100%. We’ll see.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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John ­ from ­ PA
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Feb 10, 2018 11:58 |  #27

Hmmm, two adjustable lenses have been tried on an adjustable body. Is it possible it could be a body issue?




  
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shaunmcfd
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Post edited 3 months ago by shaunmcfd. (2 edits in all)
     
Feb 10, 2018 12:00 as a reply to  @ John from PA's post |  #28

We discussed that but all of my other lenses with the exception of my 50 macro and 24-70 are canon and they are all tack sharp.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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shaunmcfd
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Post edited 3 months ago by shaunmcfd.
     
Feb 14, 2018 15:15 |  #29

2/14/18 update**

Ups dropped my camera and new lens off a little while ago and I had a chance to take about 25 random shots inside my office before I had to leave. Out of those 25 shots 25 were in focus. Holy crap I think it’s fixed. I will test it more this afternoon.


6D | 5D4 | 24-105 f4L | Sigma 50 2.8 Macro | 17-40 f4L| 135 f2L | 70-200 f2.8L ii | Sigma 35 1.4 Art | Tamron 24-70

  
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umphotography
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Feb 15, 2018 09:18 |  #30

shaunmcfd wrote in post #18563821 (external link)
2/14/18 update**

Ups dropped my camera and new lens off a little while ago and I had a chance to take about 25 random shots inside my office before I had to leave. Out of those 25 shots 25 were in focus. Holy crap I think it’s fixed. I will test it more this afternoon.


glad you got Mgmt involved and they did the right thing for you

Now sell it and go buy a Canon  :p :p :p


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Sigma focus issues and their customer service
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