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Mirror Lock
There was a long thread on this a while ago on DigitalAstro - I think - consensus was that any "shakes" from mirror flip on a long exposures (DSOs) would be negligeable but for short shots (planetry) it is mandatory. I use an LPI for planetary work so I leave it off, I guess that really it cannot do harm to leave it on - it only wastes a little potential light time and is something else you can forget to turn off again after finishing your imaging run....minor issues both.
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