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.
Specifications. 1  Badging: Argus C-Four. 2  Manufacturer: Argus. 3  Film Format: 135 (35mm) 4  Shutter: behind lens leaf type shutter. 5  Shutter Speeds: 1/10, 1/25, 1/50, 1/100, 1/300, Bulb (early version only went to 1/200) 6  Flash sync: Hot shoe, X-sync or M-sync selector switch (1/50 or 1/100 sync)