Help! Canon R6 MKII overriding shutter speed and exposure compensation @ dusk

[JF3]

At dusk and in Manual mode with auto ISO, my camera automatically resets the shutter speed and the exposure compensation. Short of manually changing the ISO myself, is there anything I can do to stop the camera from overriding my shutter speed and exposure compensation settings. (I set the ISO minimum/maximum to the lowest/highest settings possible.)

Thanks in advance!

JF3

[p4pictures]

This does seem different to the behaviour of my EOS R6 Mark II.

You described using manual mode, is that with the mode dial set to M or have you configured one of  the custom modes C1/C2/C3 to also be manual mode. You can tell this as when you select the C1/C2/C3 modes there's a small M just below the mode label. If you are using a custom mode this might explain your observation. Custom modes do not by default retain any changes you make to the settings while the custom mode is being used. So if you have C1 configured for manual exposure at dusk with auto ISO. While using C1(m) you change the shutter speed and the exposure compensation. However when the camera powers off automatically or you switch it off, then the changes are not retained and when switched back on the camera reverts to the stored values, not the previously used values. Good news is that this can be changed. Navigate to the "wrench"/set up menu section and find Custom shooting mode (C1-C3), press SET, then scroll down to Auto update set. and change it from Disable to Enable. 

With auto update enabled, each time you make a change to the camera settings while using the custom mode updates the stored settings. This is how the camera works normally in the P, Tv, Av and M modes normally.

[JF3]

Thanks for your prompt reply. I'm using M/manual mode, not a custom mode, so your solution doesn't address the problem. Any other suggestions? Thanks!

[p4pictures]

With my camera set to M on the mode dial and auto ISO. I can turn the quick control dial 2 to change the ISO, and this also moves the exposure compensation slider. However you will note that the in the box on the lower right of the screen the word AUTO which is small under the ISO text will be shown in grey, not white. In effect you have temporarily changed the ISO to your chosen value, but since you were originally in auto ISO then the camera is ready to switch back to auto ISO. This switch back to the auto ISO and no compensation occurs when the metering timer ends or you take a shot.

This behaviour is the default, but can be changed. Go to the custom functions menu page 1 and select the third entry, Speed from metering/ISO Auto, and change it to retain speed after metering. 

[p4pictures]

I made a few screen captures from my camera to show what I see...

First screen is the camera in M mode and auto ISO. It has metered the scene and determined that it will need ISO 3200. 

Second screen shows that I have turned quick control dial 2 to increase the ISO to 6400, and then the camera indicates this will be a +1 stop overexposure.  You will also see that the word AUTO under ISO has turned grey. If I wait for the metering timer to complete the camera returns to auto ISO and next press of the shutter to meter shows ISO 3200 again and no overexposure indication.

As I said above there is a setting in the menus to change this behaviour. If you change your camera to retain speed after metering then it will stay with the same ISO settings until you change them.

[JF3]

Unfortunately, your suggestion doesn't work. Changing the ISO in either Speed metering/ISO Autor or Retain speed after metering changes the shutter speed, which is a real problem for shooting wildlife. I'll try resetting the camera to factory setting and see if that works. Thanks anyway.

[Waddizzle]

That is not the behavior in my R6 mark II, either.  When the top dial is set to M and ISO set to Auto, then there should [not] be anything to override your exposure settings, except for Exposure Compensation.  

BTW, I believe the default behavior of the lens control ring is Exposure Compensation.

Have you tried resetting the camera back to its factory defaults?

[JF3]

Hmm, I returned the camera to factory settings and the problem persists. When the light is dim and I want to turn up exposure compensation to brighten the image, the camera lowers my shutter speed. It's as if exposure compensation and shutter speed are linked. I want to unlink them.

[JF3]

I have a hunch that the problem lies in the Orange menu, page 2. I set same expo for new aperture OFF. Should it be set to something else??

[Waddizzle]

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@JF3 wrote:

I have a hunch that the problem lies in the Orange menu, page 2. I set same expo for new aperture OFF. Should it be set to something else??

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Yes, that is a potential culprit.  I leave that setting [OFF], which I believe is the default setting.  When you adjust that menu setting, you can press [INFO] for an explanation of what behavior to expect for the different settings.

When you reset the camera using [Wrench 6], did you reset both “Basic Settings” and every option listed under “Other Settings”?  If not, then do so.

Before you start making adjustments to the settings, test the camera again in M mode.  There is no point in resetting the camera and then making changes to the settings before you retest it.