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Message: <blockquote data-quote="STM" data-source="post: 323141" data-attributes="member: 12827"><p>Locking the mirror up will definitely add sharpness, as you will not have the small vibrations set up by "mirror slap". I don't know what camera you have but it can be used on the D700. However, on long exposures I prefer to do this instead. I place the shutter speed on Bulb "B" with a matte black card placed in front of the lens, trip the shutter with a remote cable what allows me to lock the shutter open. I wait a second or so and move the black card away from the lens. I either use a stopwatch or even just count off the seconds, place the card back in front of the lens and unlock the shutter. It works like a champ, especially for long exposure shots taken at night.</p></blockquote><p></p>