I've got a bevy on Nikon manual focus lenses that work great on my Nikon film SLR bodies. I have matte focus screens on all my Nikon film SLR bodies so I thought I would have no problem focusing the lenses with my DSLR's. Not the case. Read numerous places that the DK-17M makes it easy to focus manually with a DSLR, so I picked one up. Put it on my D700 and it really did help. Then I tried it on my D4, thinking it should work just as well, but no way. Was missing about 50% of my shots. Really weird. Anyone else try the Nikon Magnifying Eyepieces (DK-17M or DK-21M) on their DSLR cameras, and if so, what bodies and how well did it work for you?