09-02-2022 08:54 PM
Hey y'all,
I recently purchased the 70-200mm lens and am trying to use it on my canon 5d mark iii. The lens won't autofocus no matter what settings change or no matter which firmware I use. I'm currently on firmware 1.3.6. I have also ensured that the lens is set to auto not manual. Is there anything that I am missing to be able to use this lens? the autofocus works on my M50 with an adapter, but not on my 5D.
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09-03-2022 06:28 PM
This is strictly a lens issue then. Sigma or a 3rd party will need to repair the lens.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm, EF 50 F/1.8 STM
430EX III-RT, 600EX II-RT
09-04-2022 11:14 AM
It needs to go back to Sigma for service.
I don't have every "old" Sigma lens made but the ones I do have, a substantial number, all have worked. I have run across a few older Tamron and Tokina lenses that have problems. Matter of fact I have the EX 70-200mm f2.8 which works fine.
09-02-2022 09:53 PM
Do you have another lens to try?
09-02-2022 09:56 PM
Yes. I also tried my canon 50mm 1.8, sigma EX 85 1.4, and canon 70-300. They all operated flawlessly
09-03-2022 09:47 AM
Have you looked to see if sigma has a firmware update that might correct this sort of thing?
09-03-2022 10:09 AM
Unfortunately, this is one of their older lines that doesn’t offer firmware updates through their lens hub
09-03-2022 10:46 AM
The “EX” in the model number sounds like you have an older version of the lens. One that is not compatible with the Sigma dock.
The lens probably has a focus limiter switch, which limits the range of distances that it can focus. This allows for faster and more accurate focusing at a given range of distances to your subject.
09-03-2022 10:55 AM
The only switch on the lens is to switch from auto focus to manual focus. It won’t focus at any distance. My camera recognizes that it is a 70–200 lens but won’t run the AF
09-03-2022 11:54 AM
Older Sigma lenses may not AF or work at all on new bodies. I experienced this with a Sigma 17-50mm F/2.8 EX DC OS HSM APS-C lens. It worked fine on my old 40D but would not AF on the 90D. I could control the aperture and the IS worked but not AF. I decided it was time to upgrade to FF instead of buying the Canon EF-S 17-55mm F/2.8 IS USM lens. Incompatibilities may arise with 3rd party gear on new bodies.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm, EF 50 F/1.8 STM
430EX III-RT, 600EX II-RT
09-03-2022 12:55 PM - edited 09-03-2022 12:59 PM
Not sure exactly which lens the OP may have, APO or not. But, the 70-200mm f/2.8 EX DG OS HSM was released around 2010 and the 5D3 was released around 2013. If there were some sort of compatibility issue between Sigma’s top 70-200mm and the 5D3, then I would assume that it should have been addressed years ago.
I would think that some issue with how the lens is fitting onto the camera mount is more likely than a firmware issue. A firmware issue with the 5D3 would be MAJOR.
Is Canon 5D Mark III Compatible with Sigma APO 70-200mm f/2.8 DG OS HSM
09-03-2022 12:58 PM
Sometimes dirty electrical contacts can cause this but not always.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm, EF 50 F/1.8 STM
430EX III-RT, 600EX II-RT
06/06/2024: New firmware updates are available.
EOS R6 Mark II - Version 1.4.0
Speedlite EL-5 - Version 1.1.0
Speedlite Transmitter ST-E10 - Version 1.1.0
04/16/2024: New firmware updates are available.
RF100-300mm F2.8 L IS USM - Version 1.0.6
RF400mm F2.8 L IS USM - Version 1.0.6
RF600mm F4 L IS USM - Version 1.0.6
RF800mm F5.6 L IS USM - Version 1.0.4
RF1200mm F8 L IS USM - Version 1.0.4
03/26/2024: New firmware updates are available.
EOS 1DX Mark III - Version 1.9.0
07/31/2023: New firmware updates are available.
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