My SLR is equipped with the mirror lockup function. What does it do, and when would I employ such a feature?
Answer
Mirror lockup is used to reduce vibrations with longer exposures.
When the mirror folds up, the camera shakes for a bit. For short exposure times this doesn't matter, but for times of a few seconds it will cause motion blur.
By locking up the mirror before, the camera will be still for the exposure.
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