The Df (or D800E) plus the Cosina Voigtländer Apo-Macro Lanthar 125 mm f/2,5
or the Df plus AI-S 35 mm f/1,4 (or AI 28 mm f/2)
or the D800E plus AF-S 200 mm f/2 VR II
In fact my main combo recently was the D500 plus AF-S 80-400 mm f/4,5-5,6 G VR accompanied by AF-S 55 mm f/2,8 Micro and AF-S DX 12-24 mm f/4 G
and I was taking most of the shots with the telezoom, but thats not one focal length, a 300 mm f/4 would have done a similar job probably