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[ChadS]

@Rick not sure what you mean by a "fully auto ISO" but my T2i can select ISO160 on Auto that I would not normally be able to select.

[HDNitehawk]

@Rick not sure what you mean by a "fully auto ISO" but my T2i can select ISO160 on Auto that I would not normally be able to select.

@ChadS, all the canon cameras have Auto ISO, but it is not fully Auto ISO. The 1D IV ISO is fully automatic, if set on Auto you can define a range. Say 100-12800, when you are in manual mode regardless of what shutter speed or aperture you have the camera will ramp the ISO up and down to get correct exposure, regardless if it is the correct ISO for the condition. The cameras without this function will pick your ISO in Auto ISO but they will not adjust your ISO so you have to either set your aperture or shutter speed to get correct exposure.

It can be a very convenient feature for shooting fast moving objects in changing light. But for a beginner photog it can be very distracting.