Physics of reporting: Why does the “burst” kill the shutter faster?

The carcasses of sports photographers and wedding vendors with a mileage of only 70,000 frames are constantly brought to the workshop and torn curtains. The owners are perplexed: * “Master, the declared resource is 150,000! Why did the shutter die at 70 thousands?"*.

The secret is simple: they shot exclusively with the trigger pressed in **CH (Continuous High)** mode at a speed of 7–10 frames per one second!

3 Reasons for accelerated wear in CH mode

1. Thermal overheating of return springs:When shooting in bursts of 20 frames in a row, steel Curtain microsprings experience cyclic loads. Due to friction and compression, the temperature of the springs rises higher +80°C. The metal loses its hardening and elasticity.
2. Impact loads on silicone damper:In `CH` mode, the brake damper does not have time to restore shape between blows of the curtains. The second and third curtains hit the hard substrate.
3. Destruction of the gearbox cam shaft:The metal gears of the cocking motor operate without pauses for heat removal.

How to extend the life of the shutter?

• Use **CL (Continuous Low)** mode - set the limit to 3-4 frames/sec. This will reduce dynamic overload by 60%!
• Do not press the shutter button in long bursts of 30 frames. Take short cuts of 3-5 frames.

Wear chart depending on shooting mode

Shooting mode	Shooting speed	Mechanical wear rate
S (Single Frame)	1 frame per click	1.0x (Normal factory resource)
CL (Continuous Low - Slow series)	3 – 4 frames/sec	1.2x (Minor wear)
CH (Continuous High - High Speed ​​Series)	7 – 12 fps	2.5x (Accelerated wear on curtains!)