Originally posted by sterretje @KxBlaze:
The K10D has TAv, and I think the K20D has it as well. That is a full manual mode (you can select aperture and shutterspeed) and the camera will adjust the ISO.
I'd nit pick this. If the camera is choosing the ISO, that means it is choosing the exposure, and that means it isn't full manual. That is, it will continuously change the exposure as the light changes - more light will result in lower ISO, less light higher ISO. The exposure will also change as the scene changes - ISO will go up when shooting a dark obejct, and down when shooting a light one. This to me is not "fully manual". In a fully manual mode, the exposure does not change until *you* tell it change. (whether by actually turning a dial, or by hitting the green button). TAV is an automatic mode just like Tv or Av are - it allows you to set two of the three parameters, but the camera retains control over the third, meaning exposures
"float" and are not manual.