I have occasionally used the "tape trick" for trap focus on the D800.However, I have discovered that with some lenses it doesn´t work, e.g. 70-200/2,8 II. I´ve previously only tried with the 28-300 and 50/1,8 - which works - but not with the "pro" lens 70-200.This have me wondering if Nikon uses different communcation protocols for different lenses, or what else might explain why some lenses work with tape while others don´t.Maybe there´s a difference between lenses with ring type motors vs lenses with micro motors....?Hope someone can offer some knowledge and explanation

Lenses suitable for (Nikon´s own) TC:s (they have 10 connection pins) use a different protocol.That said, if you put on a Kenko TC and tape the pins on that, focus trap will work even with your 70-200. Not so with  Nikon TC:s.BTW, here is my OP on taping pins http://www.dpreview.com/forums/post/50921251

rubank wrote:This have me wondering if Nikon uses different communcation protocols for different lenses,History now but Nikon have used different protocol in some bodies.The F5 film bodies had contacts between the body and detachable prism and at the time Sigma said at least one of their lenses was not compatible with the F5. A few Nikon bodies have had 7 rather than 8 lens throat contacts.VR and AF-s in the same Nikon lens from memory appeared when the F6 replaced the F5.The 10 contacts on a TC e compatible lenses talk to the 10 contacts in the lens throat of a TC e converter and a CPU amends the aperture read out.There seems no obvious reason for the original 80-400 to have 10 contacts as the converters do not fit on this lens. Similarly there seems no obvious reason why the converters have 10 contacts on the bayonet as they cannot be stacked and no body has more than 8 contacts. The Kenko pro 300 1.4 x works with 10 contacts in the throat and 8 on the bayonet.