The solution was right here on page 94 of my D7000 manual. And was actually an interesting read, as Nikon both added a new focus mode (AF-A) and totally left the focus control button unmarked on the body. www.nikonsupport.eu I no longer have a lens with the A/M ring (like on the 105/2.8 Micro), so I can't check. I did have the 80-200/2.8 and the 70-180, both of which have the same locking ring - and from memory it seems that Michael's answer is correct - one cannot manual focus when the lens is on A; setting it to M does not disengage the screw-drive mechanism; one needs to set the camera to M to retract the screw Join John Greengo for an in-depth step-by-step tour of the Nikon® D7000. With a hands-on introduction to your camera's operations, detailed instructions on how all the menus work, and easy tips on how to shoot great photos with this specific camera model. Explore the button layout on the Nikon Thus, on a D7100, the focus point is always displayed in single point mode. This is indeed different from dynamic AF area modes, where the camera doesn't know in advance which focus points it would use and therefore AF points are shown only when AF is active (user manual page 74). This is an old thread, but I do have first hand experience with the issue of FAST manual focus lenses on Nikon D7000 ( and D300, D2X, D700) . The problem only occurs with lenses faster than F3.5. This is unfortunate since the D7000 has the great focus confirmation dot and pointers system that work so well on my D2X and D700. Nikon D700 DSLR User Manual, Instruction Manual, User Guide (PDF) Free Download Nikon D700 PDF User Manual, User Guide, Instructions, Nikon D700 Owner's Manual. Nikon D700 DSLR equipped with a 12.1 MP FX-format full-frame CMOS sensor and EXPEED digital image processing delivers superior images quality with incredibly low-noise, even shooting up Digital photography and Nikon DSLR cameras. More focused. Nikon D7000 PDF-Ddocument in Online-Shop Operation