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.
Highly durable and precise shutter mechanism tested for 150,000 cycles. 1  The D7100 achieves shutter speeds, ranging from a high-speed 1/8000 s to 30 s, equivalent to those of the professional model D4. The flash synchronization shutter speed can be elevated up to 1/250 s. The shutter unit of the D7100 achieves high durability as it has endured release testing over 150,000 cycles, with the shutter unit actually loaded on the camera.