mirror lockup

I used it to minimise camera vibration when taking pics of the moon with my 70-300 lens on a tripod with remote release.

Normally as you press the shutter release button the mirror needs to move out of the way first, mirror lockup forces the mirror out of the way leaving the camera to settle down before the actual picture is taken.
 
At certain shutter speeds (generally done on a tripod -- I believe about 1/60 second to 1/2 second), movement from the mirror can be detectable.

Locking up the mirror separately before taking a photo removes this.

Explanations quickly turn up on the web (or on these boards) with a search.

The following is via a good site to be familiar with:

http://www.luminous-landscape.com/tutorials/understanding-series/mirror-lock.shtml
 
Because if you're photographing flowers in a wind you can choose the exact moment when the wind dies down to take your shot. That's just one example.
--
TonySD
 

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