Here's how: 1  Stand with your feet shoulder-width apart and knees bent slightly. 2  Lean forward, placing your hands just above your knees. 3  Round your back so that your chest is closed and your shoulders are curved forward.  Then arch your back so that your chest opens and your shoulders roll 1  back. Repeat several times.
Typically this count is between 100,000 and 300,000 shutter actuations, with the latter limit associated with the EOS-1D models. In fact, the Camera Shutter Life Expectancy Database is a really neat user-based site for DSLR models of several brands, including Canon.
Mode (Tv). In this AE mode you set the shutter speed (time) by rotating the main dial located next to the shutter release button. The camera will then automatically set an appropriate lens aperture for you. Tv stands for âTime value.â Use this mode if specifying the shutter speed is important. For example, you may want a fast shutter speed to freeze motion or a slow shutter speed to blur it.