Issues w/ T7i auto ISO--help pls

[ehammarlund]

I just switched from Nikon D200.  I'm looking for a setting which will allow me to shoot aperture priority but which will maintain the shutter speed at a set minimum by adjusting the ISO as needed (auto ISO.)  I can see the ISO automatically increasing so there seems to be some sort of auto ISO.  But it doesn't start until shutter speed is too long, which makes it entirely useless.

It was my goto setting on my D200; I can learn to live without it if I must but am I just missing it somewhere?  How can I tweak minimum speed?

[Waddizzle]

“That said, there's a good reason I am trying to make this work, maybe I can explain it better: When AUTO ISO is implemented properly, the "bias" is the point.”

No, that is not how or why Auto ISO is implemented.  The “bias” I spoke of doesn’t kick in until you allow the camera to automatically adjust two or more legs of the exposure triangle, and it does not matter which two.  Auto ISO has nothing to do with it.  ISO is just another leg on the exposure triangle.

“Auto ISO works best in aperture priority mode. It is supposed to simply use the lowest possible ISO, for the aperture selected, while keeping the shutter speed above a set minimum. If the sun comes out from behind a cloud, and you have "extra" light, it'll simply shorten the shutter speed to account for the increased exposure (after all you're still in aperture mode) and if the clouds get thicker it'll simply raise the ISO (without dropping shutter speed above minimum.)”

Auto ISO works the same way in any Creative mode.  It is adjusted to correct for proper exposure.  This is done after the camera has set aperture and shutter speed, not before, as you seem to suggest.  I suggest only allowing the camera to automatically control only one leg of the exposure triangle.  This gives you greater control over the end result. 

“The solution you propose sounds like it will properly accommodate for a decrease in light (by raising ISO) but I'll have to manually adjust shutter speed if the ISO is low and the light increases.”

No, depending upon the current exposure settings, and the amount of change in light, either could happen, for either case.  If ambient light increases, you may or may not have to adjust shutter speed.  Likewise, if ambient light decreases, you may or may not have to adjust shutter speed.

“This whole thing is only an issue because I only have one adjustment wheel. I used to have two wheels; one for aperture and one for ISO / Shutter (as needed) and I'm trying to work around it.”

All that you really need is one adjustment wheel.  The camera has two buttons, one for aperture and one for ISO, which temporarily repurpose the main wheel to adjust aperture or ISO.  You just need to practice using the camera.