well I tried to play with ISO range but it is mostly a pain, it is faster to selec the proper ISO in that case, you loose the idea of "auto"

but you are right I should play with the speed range, I work with primes so that does not change a lot every second, then place a safety shift on speed, and see if that work !
thank you !
still I would love Canon to provide a simple way to do so ...
No need to set the ISO range, or use ISO safety shift with the IV. Safety shift was the best we had with the III, and 1/60 was the fastest we could set for minimum shutter speed.
To do what you want with the IV, just set the minimum shutter speed to 1/400th(or wherever). Use Av mode. Set to Auto ISO. Use EC as normal with Av. SS will not drop below 1/400th, and ISO will climb/fall as necessary. I have the shutter speed range in the My Menu section so I can quickly Enable it, and change the value depending on lenses or needs. I find this a very handy feature for shooting Av mode in changing light conditions.
AutoISO in M mode still serves no real purpose, especially with flash, IMO. Tv mode, auto-iso works just like ISO-Safety shift did with the III, which is just fine.








