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Hello Philip,
You don't need to use the mirror lock for long exposures - it is usually used for bright objects and/or very short exposures where the vibration of the mirror can make a difference.
If you really want to use it - turn the mirror lock on and set the camera self-timer to 2 seconds. At the start of the exposure the mirror will open then after 2 seconds the exposure will start. If your timer is set for 60 seconds the actual exposed time will be 58 seconds.
Regards,
Tony.
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