Auto-ISO is available on Canon DSLRs, but perhaps not in the form you want it.
The 1D MkII, for instance, allows auto exposure bracketing by varying ISO, but this requires that custom function 06 isn't set to 2 (1/2 stop increments for shutter speed, aperture and exposure compensation).
If timing is so non-critical that I can acccept one of a sequence of three images based on ISO (and consequently, relative exposurel), then I may have time to set the ISO myself.
The 20D in the "basic zone modes" has automatic ISO between 100 and 400, but that means you can't shoot raw.
I guess that counts as "botched up".
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Pretty much so. There's no reason why RAW should be excluded from auto-ISO, and there's no reason for it to be limited to ISO 400. Unless a very poor algorithm is used, a camera isn't going to pick ISO 1600 unless it needs it. So, what we lucky owners get is ISO 400 with motion-blur, and/or wide-open optics!
An intelligent namual-exposure, auto-ISO mode, IMO, would have an EC setting just like fixed-ISO AE modes do now, and give the user options on what to do about fulfilling that EC granularity. The real solutions are either to get a sensor-gain system with granularity a bit finer than a stop (that doesn't compromise read noise at any ISO), or to honor user preferences about how to compromise the chosen Av and Tv values to maintain relative exposure, if desired, using Canon's current 1-stop true ISO granularity. This could be in the form of a list - the first 1/3 stop could be listed as Av, Tv, or none, for bringing the exposure up to level. The same for the second. This way, relative exposure need vary by only 1/3 stop.