EOS R5 Mark II - Can AEB be set to change shutter speed between bracketed shots when in manual mode?

[ruthlevenstein]

I've recently picked up the R5 mark II and I can't seem to figure out how to set it such that when using AEB in manual mode, the aperature and ISO stay constant between shots and the shutter speed changes.  (I am shooting the moon and want to capture the craters.  All of my previous cameras would change the shutter speed which is preferable for me for these photos.)

[p4pictures]

This is interesting and a good point, I can confirm the same happens for me when the main dial is set to control aperture value on the EOS R6 Mark II. Additionally I found that only the main dial needs to be changed, if you leave the quick control dial 1 with it's default setting of aperture in manual mode, then changing the main dial to aperture as the only change will still change the behaviour of AEB in manual mode. 

Additionally I have an EOS R6 so I checked that too. It does not change and will always bracket by changing shutter speed when set to manual exposure mode. 

[lanrki]

Interesting that the issue reproduces in different cameras, even in 5D mark IV. Should I report it somewhere? Would be great if Canon will fix this in next update.

[Waddizzle]

I have never understood the issue in this thread.  The solution you seek is unconventional. 

The camera is capable of automatically controlling all legs of the exposure triangle.  It is capable of controlling akk 3 legs, any 2 legs, or any 1 leg.  

The conventional method of allowing the camera to control only shutter is to Av mode with ISO dialed in to a specific setting.  If the camera calculates an initial shutter speed that is something other than what you are looking for, then use AEC to bring to where you need it. 

If AEC doesn’t bring the shutter speed to the range you need, then you should be able to make further adjustments by adjusting your AEB setpoints. 

The default AEB setpoints are -1, 0, 1.  There’s nothing stopping you from setting as 1, 2, 3.  Or, as -1, -2, -3.   

I use to bowl a lot.  One of the hardest lessons a bowler needs to learn is to take the shot the lane wants to give you, not the shot that you want to take from the lane. 

The central issue in this thread seems to fit the same scenario, to me.