I was very surprised that the 5D III did not have auto iso with EC.
Setting ISO seems to be a throwback to days of film, where ISO change needed replacement of the film. The Av, Tv & ISO "triangle" is now much more flexible, ISO is of equal rank in the equation as it can be changed instantly, precisely and automatically.
I take very varied shots. generally using Av mode. Generally "slow" shots are OK, but if something unexpected happens it can be missed or turn out blurry through motion blur. Auto ISO seems like a solution, but the idea of no adjustment seems crazy.
In general I think I know (in priority order)
1/ the DOF I want hence the Av. At least roughly.
2/ I know the speed I need - or at least that it should be no less than the numerical focal length ( e.g 1/200 for a 200mm lens).
3/ I know if the meter is going to be roughly right or will need compensation.
4/ with all that the iso can be set as near 100 as will work
I guess what I really want is an auto mode that reflects these priorities so I set ideal Av (optionally Tv) and EC and shoot. An algorithm would adjust ISO, perhaps up the Tv from the lens minimum and perhaps alter Av a bit if the iso was looking a bit extreme.
Setting ISO seems to be a throwback to days of film, where ISO change needed replacement of the film. The Av, Tv & ISO "triangle" is now much more flexible, ISO is of equal rank in the equation as it can be changed instantly, precisely and automatically.
I take very varied shots. generally using Av mode. Generally "slow" shots are OK, but if something unexpected happens it can be missed or turn out blurry through motion blur. Auto ISO seems like a solution, but the idea of no adjustment seems crazy.
In general I think I know (in priority order)
1/ the DOF I want hence the Av. At least roughly.
2/ I know the speed I need - or at least that it should be no less than the numerical focal length ( e.g 1/200 for a 200mm lens).
3/ I know if the meter is going to be roughly right or will need compensation.
4/ with all that the iso can be set as near 100 as will work
I guess what I really want is an auto mode that reflects these priorities so I set ideal Av (optionally Tv) and EC and shoot. An algorithm would adjust ISO, perhaps up the Tv from the lens minimum and perhaps alter Av a bit if the iso was looking a bit extreme.