<p>I have been having great results on my F6, FM2n, and D800 with the Zeiss manual focus lenses for Nikon. I have both the older non chipped and newer chipped lenses. They move 35mm film a step closer to medium format. On the D800 the optical quality shines. The down side is size, weight, and cost. They have an aperture ring although on the F6 and D800 you set the aperture with the front control wheel. </p>