Nikon D4 vs D800 vs D600 full-frame low-light showdown - photo 1Nikon D4 vs D800 vs D600 full-frame low-light showdown - photo 2Nikon D4 vs D800 vs D600 full-frame low-light showdown - photo 3Nikon D4 vs D800 vs D600 full-frame low-light showdown - photo 4Nikon D4 vs D800 vs D600 full-frame low-light showdown - photo 5