...And to take in account IS. The AutoISO doesn't take in account the IS. Think 70-200 f/2.8 IS. What Tv should I choose for AutoISO? 70? 200? Auto? But "Auto" raises the ISO on 1/(FLength) basis (ok, more or less) thus mitigating the advantage of having an IS on your lens.
They need to implement also an option like "Exposure Bias" in 1/3 stop in/decrements to handle this.
I will not go through this endless loop again. Please read up on how exactly Auto-ISO is implemented on the Nikon D4 and D800 (http://www.dpreview.com/reviews/nikon-d800-d800e/16). This is as good as it gets currently. Although it is not complete or "perfect" either.
Read it, thanks for the link. However I think that having much more precise control (ie. in +/- 1/3 stops or 1/2 stops, WRT Lens' Focal Length) is better than having a 5 step scale of -0.5xF, -0.25xF, 0, 2xF, 4xF - where F is the lens' focal length like the Nikon has.
Also, I think that my proposal is much more open to the future cases (being linear) compared with Nikon's which seems exponential / logarithmic.
As for GUI implementation, rather than a slider, I would propose a spin edit control (for ex see http://documentation.devexpress.com/#WindowsForms/clsDevExpressXtraEditorsSpinEdittopic) which is much more compact space wise and can "hold" much more values than a slider. But if Canon want to use sliders like in AFMA screen, no problem for me. Just to implement it.
Sorry, I cannot follow re. spin control .. what would that lookk like ... got a picture?
I do not have the impression that Nikon's fine-tune feature is logarithmic .. but I agree with you, that users should have even more direct control over Auto-ISO behaviour ... which parameter (Av,Tv,ISO) should be adjusted first, which second, which third and under which circumstances (min - max ranges, focal length used, IS active or not).
And I also do NOT consider the Nikon D4/D800 Auto-ISO feature to be the single best imaginable solution to this problem. I just know, it is far superior to any Canon implementation up to now. This is why I would like to see a better Auto-ISO implementation on Canon cameras ... making it fully functional AND user-controllable AND as easy to use as possible! :-)