I have a microscope adapter which fit my previously owned d800 "mount". I need to get another nikon camera, probably used, which uses the same "mount" as the d800, to attach to my microscope adapter. It needs to be a dslr and would prefer something smaller than my prior d800, if available. Most important is that it must have the same mount, i.e., take the same size lenses as did the d800. Any suggestions?