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Thanks for clarifying

I did notice that Nikon hacker claims to have a hack for the D5100 and D7000. I also e-mailed Nikon to ask if an "astronomy firmware" update could be made available for the D5300. Nikon has not responded yet, which is a shame because Nikon Hacker gives me the impression that it is possible to do.

Thanks once again for's nice to know that someone is continuing to support the efforts begun by Dave Coffin.