Originally posted by v5planet I use a K-7 and lately I've been experimenting with different shooting modes and settings within them that I never bothered to screw around with. For this reason I've only just recently discovered it's even possible to put Av into Auto ISO with the Green Button.
So my question is pretty straightforward: when you toggle over to auto ISO, what kind of minimum shutter speed is the camera trying to maintain? Does it simply set the the ISO high enough so that a stationary subject can be captured crisply at a given FL? Or will it choose settings sufficient for a target that is moving at a reasonable clip?
I guess what I'm trying to figure out is: is there really any reason to use Av mode with Auto ISO activated over just switching over to TAv and choosing both an appropriate aperture and shutter speed for your given aims?
My experience with auto ISO mode is that the camera will typically move ISO up to maintain the minimum shutter seed for the focal length. The result can be somewhat unpredictable, if you put the range of ISO too great. For that reason, many people who shoot in Auto ISO mode, have it screwed down to a very limited range. They would prefer after that to change shutter spoeed, as opposed to increasing ISO further
Also,m in flash mode, the camera will adjust ISO first, when auto ISO is used, before it attempts to use any flash. so what happens is that in Av mode with auto ISO on, in flash, it attempts fill flash only. it never considers the thought you want the flash to be the primary light.