EOS R6 overexposing with 35mm lens

[astanze]

Hello!

My last two sessions using my 35mm on my R6 have started overexposing some of my images even when my settings have stayed the same. I put my 24-70 on and it did not do that so I am guessing it is the lens? I also got an error a couple of times that said there was an error with the lens and camera connection. Anyone have an idea of what I need to do? 

Thank you! 

[deebatman316]

What is the full name of this lens. Is it a Canon brand lens or 3rd Party. Is an EF-RF Mount adapter being used if so is it Canon or 3rd Party. Are you using native RF lenses or adapted EF lenses. Is this camera toe original EOS R6 or EOS R6 Mark II. Is a flash being used if so is it Canon or a 3rd Party flash.

[p4pictures]

Take a note of the error message; the number is particularly important. It could be a failing aperture assembly in the lens, or one that fails to close to the desired aperture consistently. 

[astanze]

Canon EOS R6, Canon Lens EF 35mm 1.4L USM and I do use an adaptor. I have been using both of these for about 2 years now and just started having this issue. 

[deebatman316]

Is it the Canon brand adapter or a 3rd Party mount adapter. 3rd Party Mount adapters are nothing but trouble. Stick with the Canon brand mount adapters.

[astanze]

It's a Canon adapter. 

[deebatman316]

Set the camera to Av Mode and then set a small aperture such as F/8 or F/11. Then press the depth of field preview if an error comes up. If an error message does pop up tell us the error code is. Is that the only lens that causes the error message.

[astanze]

I did that too and it was fine. I am at a loss right now! Thank you for all of the suggestions! 

[deebatman316]

This sounds like a lens problem. Can you try it on a DSLR camera. It sounds like the aperture isn’t always stopping down for each shot. Especially when shooting continuously at a high rate.