markol wrote in post #13200647
This. If you want to do this you'll need to use Nikon.

Yep. I just read on the Nikon site...
"
As an example, let’s say you are shooting outdoors at a wedding and you have your camera manually set to a low ISO setting of 100 because there is plenty of light available. Then as you follow the bridal party indoors where the light level is much lower, your camera’s exposure meter indicates it will require a slower shutter speed (and/or wider aperture) to achieve correct exposure. Rather than having to manually change the ISO to make the camera more sensitive for this lower light level, the AUTO ISO feature will automatically adjust the ISO setting up to obtain correct exposure for the new lighting conditions.
The exact minimum shutter speed setting where this “jump” to a higher ISO takes place can be set on most Nikon digital SLR cameras using the AUTO ISO control in the Custom Setting menu of your camera. For example, you may want to shoot at a fixed ƒ/stop and the lowest ISO possible until a shutter speed of 1/15th of a second is required to make a proper exposure. In a programmed exposure mode the camera will continue dropping the shutter speed lower and lower until the 1/15th is reached and then AUTO ISO will automatically increase the ISO upward to keep a good exposure. The camera will continue to increase the ISO setting upward until it reaches the “Max.” setting you’ve chosen in the camera’s AUTO ISO menu, or to a maximum of 1600 ISO.
This is a big advantage to any photographer who often manually changes the ISO settings as the light quickly changes since it allows full concentration on the subject rather than the camera controls. If you return to an area where the light level increases, the camera will automatically drop the ISO setting again to the lowest setting possible for the light level you are now shooting in."
Now honestly, why in the world would Canon not have the feature this customizable on a $3,000 camera?