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Canon 6 Mark ii 'release without shutter' option?

Hi,
I have an old Nikon lens that I'm using on my Canon 6D Mark ii for stop motion animation.
I get an error err 01, saying the camera lost communication with lens.
For my purposes I don't need communication between the camera and the lens and would like to manual focus
I am trying the fix this gentleman shows @1:25 in the youtube video below,
https://www.youtube.com/watch?v=vF0QjhsgeSw&list=PLjfkGHi9ELj5bOC-MPSMKQJCqI4ccU7RE&index=7&t=81s
and to cover the sensor in my Nikon lens with electrical tape.
Yet when I go to the custom function III tab, I can't find any 'release without shutter' option.
The closest I can find is LENS AF, with AF Stop, and 7 other options.
Will any of these options give the same result of 'release without shutter', for example if I choose AF Stop, or AE Lock?
Thankyou for your time, any advice would be welcome.
I have an old Nikon lens that I'm using on my Canon 6D Mark ii for stop motion animation.
I get an error err 01, saying the camera lost communication with lens.
For my purposes I don't need communication between the camera and the lens and would like to manual focus
I am trying the fix this gentleman shows @1:25 in the youtube video below,
https://www.youtube.com/watch?v=vF0QjhsgeSw&list=PLjfkGHi9ELj5bOC-MPSMKQJCqI4ccU7RE&index=7&t=81s
and to cover the sensor in my Nikon lens with electrical tape.
Yet when I go to the custom function III tab, I can't find any 'release without shutter' option.
The closest I can find is LENS AF, with AF Stop, and 7 other options.
Will any of these options give the same result of 'release without shutter', for example if I choose AF Stop, or AE Lock?
Thankyou for your time, any advice would be welcome.