Canon 90D with Sigma 70-200 overexposes all pictures taken through the viewfinder (live view ok!)

[philippelang]

Hi,

I'm the happy owner of a Canon 90D. I have just bought a Sigma 70-200 lense, and I noticed that all pictures taken through the viewfinder are overexposed, no matter what I do. If I want to have a picture that is close to reality, I have to compensate the exposition with -2/-3. Tha't's a lot, not just "fine-tuning". With the other lenses, I never had this problem: Sigma 18-35mm f1.8, Canon 50mm f1.8...

Is that Sigma firmware problem? 90D firmware problem?

[philippelang]

I did a reset, and even a firmware reinstallation. I checked all menu configurations one by one between both 90Ds, but nothing that explains this behaviour on my second 90D.

It's really strange... Either it's a Sigma firmware bug with 90Ds or one of my 90Ds is faulty in my humble opinion.

[ebiggs1]

In that case and you are certain you cleared all settings, I have to agree, "...one of my 90Ds is faulty in my humble opinion."

Send it to Canon for a C&C.

[philippelang]

I'm hesitating sending the body to Canon, because a LOT of people using a combination 90D + Sigma experience exactly the same thing. The latest firmware version of most Sigma lenses mentions an "improvement" for viewfinder shooting with a 90D. I wonder if they did the job correctly. For quite some people on a Facebook 90D forum, the answer is NO!

[ebiggs1]

I can't help you there (Sigma) but a C&C done by Canon will confirm whether it is the camera or not. Otherwise you need to contact Sigma. Neither Canon nor any of us can not help you with that

[philippelang]

OK, thanks. I'll considering sending one of my 90Ds for a check. Do you know if there's a way they can "calibrate" the metering sensor?

[jrhoffman75]

Canon U.S.A., Inc. | Canon Maintenance Service

18-point service states they will check exposure. 

If you send be sure to specifically state what your problem is.

[Camilo06]

Hi, did you find any solution? I have a canon 90D and i am having the same problem with all my sigma lenses 18-35 art 18-300 C 150-600 C. Horrible overexposure through the OVF.

[philippelang]

Hi, I got yesterday an answer from Sigma in my country, and they said they had received a new firmware for the 18-35 and the 70-200. Unfortunately, these firmwares are not available for a remote firmware update with the dock: I would have to send both lenses per post, something I'm not particularely motivated to do. Sigma insisted that this update might not solve my problem: they cannot garantee it.

I'll wait until I have my lenses updated before I send my second 90D to Canon. Do you confirm you don't have problems with non-Sigma lenses on your 90D? Maybe you don't have any non-Sigma lens, except your kit lense? 🙂

[Camilo06]

I had a 24-70L and i didn’t have this problem, is happening only with sigma lenses

[cn4873]

I'm having the same issue with my Sigma 150-600 C I tried everything and thought it was somthing I was doing wrong. My Canon 7I makes this 90D look bad. I thought I was moving up in life. Thanks for the post it's given me some hope and a new direction.