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Mirror Lockup is an option in DSLRs that allows the mirror to be retracted prior to a photo, giving much quieter operation and reduced vibration.

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What is mirror lockup and what is its primary function?

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 i …
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