Originally posted by morfic Why do we have those?
Isn't Sv just P after selecting an ISO (Less the "Hyper" part)?
and isn't TAv just M with Auto ISO?
what do Sv and TAv have that i couldn't get from the alternatives?
Is it marketing only?
You know, if I would design camera I would redefine all modes
As we all know, exposure is defined by the combination of three parameters: shutter speed, aperture and sensitivity.
In film days you had fixed sensitivity and photographer was able to control exposure by adjusting two parameters: shutter speed and aperture. So, naturally it appeared two automated modes: shutter priority and aperture priority. You have one fixed parameter (sensitivity), one chosen by photographer and the third one, calculated by the camera.
In digital era Av and Tv became obsolete because sensitivity isn't fixed anymore and photographer can control exposure by changing all three parameters on the fly.
Therefore digital cameras should have had ASv, TSv and TAv modes instead of Tv and Av modes from the very beginning. Photographer chooses two parameters and camera sets the third one based on other two parameters.
Pentax probably were the first to implement those in K10D: You have TAv mode there and you can customize your e-dial to change ISO in Av and Tv modes, so effectively you get ASv and TSv modes instead.
Sv mode is redundant, it just duplicates Tv and Av with one e-dial set to control ISO.
So, would I design camera, it would have P, M, X, Bulb, TAv, TSv and ASv modes