Which Nikon? the P7100, P510 or p7700

I have just about every Nikon top of the line SLR except the F6, every Nikormat, and the NikonP510 and the Nikon P510 and the p7000. I also have the D70, D90, D200 and D300. You can't go wrong with any of them. I took my best ever photo of the moon last night, with the P510, and I wish I could show it, but I don't understand the new rules.

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Jim Kennedy