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.
T165 picosecond to nanosecond laser diode pulser. Edge-triggered pulse, user adjustable width. Optical pulse widths from 100 picoseconds to 850 nanoseconds. Laser pulse current up to 400 mA, 700 mA with heat sinking. Pin socket connection to Type-1 butterfly-packaged laser diodes, solder connect optional; compatible with other diode packages.