I shoot in Manual mode exclusively. I use the Main Control Ring (behind the shutter button) to control my shutter speed. Recently it has started to malfunction. When I try to increase my shutter speed, it sometimes does nothing, sometimes it decreases the shutter speed, and sometimes it does what it is supposed to do.
Perhaps it is getting worn out from so much use. Hopefully, there is a fix that won't involve sending it in for repair.
I have one RF lens that I mainly use, so I use the control ring on the lens to adjust ISO and reassigned another dial for my shutter speed.
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What is the exact camera model are you using?
Do you see any error messages?
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Thanks and have a great day!
What model camera is it?
There's a fix for this that worked on my EOS 50D. Don't know what other models it might apply to. The rubber "tire" on the Main Dial was slipping, resulting in erratic function or no function. The fix was to very carefully apply a few drops of glue between the tire and the "wheel". Restored the Main Dial to full function ever since.
This saved me from replacing the shutter button/Main Dial assembly, which in my research was looked to be the fix. I almost trashed a perfectly good 50D until I found the fix.
I suggest you send the camera to Canon for inspection and repair. Glue + camera is not a recipe for success. 😲
Let Canon resolve the issue for you.
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