topic Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro in EOS DSLR & Mirrorless Cameras

5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 00:54:35 GMT

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.

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

kvbarkley — Sat, 03 Sep 2022 01:53:59 GMT

Do you have another lens to try?

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 01:56:50 GMT

Yes. I also tried my canon 50mm 1.8, sigma EX 85 1.4, and canon 70-300. They all operated flawlessly

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

kvbarkley — Sat, 03 Sep 2022 13:47:28 GMT

Have you looked to see if sigma has a firmware update that might correct this sort of thing?

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 14:09:56 GMT

Unfortunately, this is one of their older lines that doesn’t offer firmware updates through their lens hub

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Waddizzle — Sat, 03 Sep 2022 14:46:33 GMT

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.

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 14:55:25 GMT

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

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

deebatman316 — Sat, 03 Sep 2022 15:54:22 GMT

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

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Waddizzle — Sat, 03 Sep 2022 16:59:16 GMT

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

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

deebatman316 — Sat, 03 Sep 2022 16:58:14 GMT

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

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 17:04:37 GMT

That is the lens I am trying to use. I can’t find any forum posts or similar issues with the same body and lens. I am assuming it’s an issue with the lens. It functions on my m50 kinda. The camera doesn’t have an issue with any other lens. I have cleaned the contacts on the lens and the camera and it didn’t make a difference

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

deebatman316 — Sat, 03 Sep 2022 18:34:43 GMT

What do you mean by it works on your other camera kinda. Is it slow to AF or have any other issues.

-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

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 19:30:27 GMT

On the m50, it is constantly focusing even when not engaging back button focusing. Holding down the focus button doesn’t make any changes

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Waddizzle — Sat, 03 Sep 2022 19:56:05 GMT

Cleaning contacts rarely fixes anything, not unless you can see visible debris or discoloration. The mere act of mounting and dismounting the lens creates sufficient friction on the contacts to keep them clean.

Make sure the camera body contacts are springy and not getting stuck. Otherwise, I do not know what else to do about it. They just do not want to play together.

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Waddizzle — Sat, 03 Sep 2022 19:57:00 GMT

Mirrorless cameras work a little differently compared to a DSLR.

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

deebatman316 — Sat, 03 Sep 2022 21:27:08 GMT

Does OP have BBF (Back Button Focus) setup on their 5D III. Since the shutter and AF Start buttons have been decoupled now.

-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

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 21:46:42 GMT

Yes I do. I put the camera to factory settings and it didn’t help. I also tried to have a few different buttons operate the AF and it didn’t change anything

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

deebatman316 — Sat, 03 Sep 2022 21:50:41 GMT

A factory reset does not always clear (CF) custom functions. Try the camera in A+ Mode (Full Auto) overrides all custom functions.

-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

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

Stephen-Blair — Sat, 03 Sep 2022 22:02:13 GMT

No luck with that either. I have chalked it up to a failure of communication with the lens and body

Re: 5D mark iii with Sigma EX 70-200 f2.8 dg macro

deebatman316 — Sat, 03 Sep 2022 22:06:25 GMT

Usually a faulty communication will cause an error code of some kind. It also seems strange that it works when its adapted to an EOS-M/ EF-M series body.