Originally posted by wings I did try using the High Speed Priority a few times, but could not detect any functional difference than using Tv shutter Priority. I am sure that there is a reason that it is available, so hope to learn more about it.
In Tv mode, you choose the shutter speed and the camera chooses an aperture setting for a good exposure. In Program (P) mode, the camera chooses
both the shutter speed and aperture setting. How it makes these decisions is controlled by the program line setting. High Speed Priority will tend to choose faster shutter speeds and wider aperture values. You just point and shoot. It's convenient for quick shooting, but the camera may pick values that are inappropriate for certain situations.
I'm sort of repeating what others have said above in a different way, but wanted to point out to the OP the basic difference between Tv and P modes.
Originally posted by bschriver11 I can use the front wheel to change shutter speed when i need it faster and the rear dial to change aperture to control depth of field when it is most important, hit the green button and your back to what the camera chooses. It's like having two modes available without needing to reach for the mode dial.
This is how you override the values the Program has chosen. Pentax calls it Hyper-Program. The camera chooses values based on the selected program line preference, but you get to tweak them for specific situations.
Forgive me if I have overstated the obvious. It may not be obvious to everyone though.