What is the difference between Program Mode (P) Aperture Priority Mode (A or AV) Shutter Priority Mode (S or TV) and Manual Mode (M)? Program Mode automatically decides how much to, freeze motion and how wide the distance from your camera you should see sharpness. However, it lets you control how much noise there will be. All three of those controls affect how much light there will be. This means that you cannot fully control how much light you get in your image unless you sue manual. Manual allows you to fully control your camera including all of these controls and more. Aperture Priority Mode (A or AV) is like Program Mode (P) except you can control how wide that distances of sharpness is away from the camera. Shutter Priority Mode (S or TV) has one difference from Program Mode (P), it lets you control how much is froze.