[mst]

To my knowledge, it's a dedicated feature on some Canon cameras (not sure which, though). I must admit that I'm not sure if it's a feature on any Nikon camera (read: if there is a dedicated menu entry called "focus trap"), but you can egt the same effect with any Nikon that allow to assign AF to a dedicated button on the rear and offer focus priority in AF-S (Single Shot, not Silent Wave) mode. With such a setup, focus where intended, press the shutter button, wait for subject to move in focus, camera releases.



This should be possible with any lens on a Nikon. On a Canon camera, it may require an AF confirmation chip in the lens.



-- Markus