Hi Alex
Our Pentax had a function where the mirror would flip up and then 2 secs later the shutter would fire. Although this did reduce vibrations from mirror slap, our DSLR lunar images still suffered from blurring as the vibrations had not died down in that 2 sec period.
I would assume that if the Nikon has a mirror lock up function, you should be able to lock it up, wait for say, 10 secs, fire the shutter and then release the mirror. If it can do this, it should allow you to get nice, sharp images (seeing permitting!) at 1/15 at 100 ASA.
Cheers
Dennis
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