Originally posted by aleonx3 I don't think it is the same, TAv mode support EV compensation whereas M with auto-ISO does not.... at least that's my understanding after trying it on Nikon D750 (I could be wrong though because I didn't spend a lot of time on it). Similarly, on k-01, it does not have TAv mode but M with auto-ISO..
I also think that it is difficult to implement TAv mode without front-and-rear dial, which Canon DSLR model does not have.
Some Nikon bodies with auto-ISO have EV comp. They have had for some years and I believe D750 has it too. And nowadays it pretty easy to switch between auto/manual ISO on Nikon, just hold ISO-button and turn front wheel.
Nikon have some nice features in auto ISO I would like on my Pentax, FI that you can set slowest shutter speed that auto ISO use (or auto like on Pentax), and when adjusting ISO in auto ISO you adjust the lowest ISO in the auto ISO range instead of going back to manual ISO.
The auto-ISO functionality have not changed much on Pentax bodies since K-7, but I really hope Ricoh understand that they could make the cameras even more flexible with a few small changes on auto-ISO.
- User defined slowest shutter speed, maybe an option for TAv mode. So that you either set an absolute shutter speed, or the lowest shutter speed you want to use so the camera can set faster shutter speed if ISO have reached the lowest ISO and the image risk being overexposed.
- Possibility yo change lower and upper limit of auto-ISO without having to enter menus.
- Wider range of "auto ISO parameters" instead of slow, normal and fast it could be +-4 stops of nominal shutter speed so can make full use of image stabilization. Or maybe even an auto setting where camera adapt slowest shutter speed depending on focal length and how much camera shake there is.