How to combat mirror shock using a camera's mirror delay ...

STEVE MOULSHER, PETAPIXEL:

SLRs all suffer from the same problem: that mirror flapping up and down causes the camera to move at the time of exposure. “Mirror shock’ is what’s caused by the mirror itself and not the photographer’s ability to hold the camera still.

Some cameras allow you to program an extra delay on the mirror, and this goes a long way to getting rid of mirror shock.

Read more, here.