Canon 6D Back button auto focus and ISO settings

[mpsully2015]

I was curious why when I am shooting in TV mode and I am using the back button auto focus that the camera will automatically change the ISO setting that I set. Is there something that I have missed in the settings or is this an automatic feature that can not be turned off?

[Skirball]

Do you have it set to Auto-ISO?  The camera shouldn't change ISO otherwise.

[mpsully2015]

No ISO was not set to auto ISO

[ebiggs1]

In the Menu, Clear All Settings.  Try again.

[p4pictures]

Sounds like you have safety shift set in a custom function

Check C.Fn 1-6 Safety Shift - you may have it set to 2 - ISO Speed

PAge 306 in the EOS 6D manual