Local shop in Pittsburgh (Bernie's) is still waiting on body only cameras - expecting shipment Th or FR. Did pre-order for 4 customers but placed an order for 'a few extra' for walking customers ??
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And M, makes no sense at all Sure you could set your limit time, but in AV you could get faster if the light allows it. And in M, the camera has to use higher ISOs because 1/800 F4 just doesn't work in bright sunlight with ISO 200, and its not allowed to use faster times in M. So no gain in picture quality there.
Who needs the facts when we have so many learned opinionators ??
I think you missed the part where all those facts he listed are the same exact facts that we also listed and it is those facts where the problems lie.
From the horses mou...erm, manuals...pages:
Auto ISO Range: Minimum 100; Maximum 12800
If the ISO speed is set to "A" (Auto), the actual ISO speed to be set will be displayed when you press the shutter button halfway. As indicated below, the ISO speed will be set automatically to suit the shooting mode:
Shooting Mode ISO Speed Setting A+ Automatically set within ISO 100 - 12800 P/ Tv/ Av/ M Automatically set within ISO 100 - 26500 *1 B Fixed at ISO 400 *1 With flash Fixed at ISO 400 *1 *2 *3
*1: The actual ISO speed range depends on the [Minimum] and [Maximum] settings set in [Auto ISO Range].
*2: If fill flash will result in overexposure, ISO 100 or a higher ISO will be set.
*3: When using bounce flash with an external Speedlite in the <A+> and <P> modes, the ISO speed will automatically be set to ISO 400 - 1600.
As I get page 125, notes 1 and 2 indicate ISO will be set automatically within the full range, or if you have set Auto ISO Range limitations...within the range you have selected. In the case of bounce flash, it defaults to ISO 400 for third-party flashes, defaults to an ISO range of 400-1600 when using canon-brand Speedlight external flash, and WILL automatically select any ISO from 100 on if the camera metering decides the scene will over-expose.
From all that, it appears "Auto ISO" is pretty much indeed COMPLETELY automatic within the FULL RANGE of possible native ISO settings. The only case that seems limited outside of the context of exposure issues is Auto ISO + Flash when using a third party (i.e. non-Speedlite) brand.
Here's a mirror.
Should be up for the next two weeks.