EOS R6 Mark II Exposure bracketing changes aperture in M mode

[Ovacheerdad]

Question for those that use AEB. So I was watching some videos about exposure bracketing. Camera set to Man. ISO 100. and F/2.8. When I do a 3 shot stack it changes the aperture value to change the exposure. But when I run the same settings in AV mode, it keeps the aperture constant and actually changes the exposure.  All the videos I'm watching online show that while in M mode, it does not change the aperture. Do I have something set wrong in my camera?

[shadowsports]

This is on your R6 Mark II right?

https://cam.start.canon/en/C012/manual/html/UG-03_CustomShooting_0050.html

In M mode you choose Shutter, Aperture and ISO

https://cam.start.canon/en/C012/manual/html/UG-03_CustomShooting_0060.html

If you're using ISO Auto then you can adjust exposure compensation.

[Ovacheerdad]

On the R6Mii yes. 

[shadowsports]

Greetings, 

I'm sorry you're using AEB. 

Three consecutive shots so you're questioning why the exposure is changing between the three shots? In Av vs M.

The whole purpose of AEB is to give you three shots one underexposed one correctly exposed and one overexposed.

if you don't want your aperture to change you have to disable ISO Auto.  

This should keep your aperture from changing after metering.

[Ovacheerdad]

Just tried changing that setting.  Still changes the aperture. Ill try and take a video. 

[Ovacheerdad]

Here is what it is doing. https://youtube.com/shorts/dZSetALz94M?si=O9uADYmT5xy31qmJ

[stevet1]

Ovacheerdad,

I have a T8i, and just experimented with this.

If I put my camera in Manual Mode with a fixed  ISO, and set an auto exposure bracket of three shots, my camera will automatically change the shutter speed.

If I use Av mode, it will keep the aperture and change the shutter speed.

If I use TV mode, it will keep the shutter speed and change the aperture.

Manual Mode surprised me. I would have expected the camera to refuse to make any adjustments.

While my camera is adjusting the shutter speed , maybe yours is adjusting the aperture. It might not be a flaw at all.

BTW, my camera did this regardless of whether I had Safety Switch disabled or not. The AEB must override the feature somehow.

Steve Thomas

[Mack023]

I ran into this before! In Manual mode, the camera usually defaults to changing whatever you aren't 'locking' down. If you want the aperture to stay still for your stack, try setting your ISO to a fixed value (not Auto) and then check your AEB settings. Usually, if ISO and Aperture are fixed, the camera is forced to use shutter speed to bracket the shots.

[Ovacheerdad]

It is set at ISO 100. It still does it. 

[Ovacheerdad]

After doing some digging a lot of digging actually, I'm fairly certain i found the answer in an old post from 2017. (SEE BELOW). I am at work and will try this as soon as i get home but I'm sure this will fix it. Thanks everyone for the input and trying to help.