Shooting in AV with auto ISO tells the camera to find the balance between ISO and shutter speed. I don't think there's a way to have it lean to a faster speed.
I would just shoot in Manual, choosing the speed I want, with auto ISO.
I know it's possible with the 7D Mark II. If I'm shooting a moving child, I would prefer to have the higher noise, even up to 2,ooo ISO which can still be usable versus what the camera tends to do sometimes is pick a slow shutter and keep the ISO lower. It would be great to have that option. wishful thinking I know...lol




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