So, as I understand it, there are two DOF preview systems for Nikon SLRs. There's the old mechanical system, which was simply a lever that stopped down the lens by adjusting the aperture prong, which had a mechanical linkage to the aperture ring. This system does not work well with G lenses because older film bodies do not "know" how to set the aperture from the camera controls and the mechanical stopping point doesn't exist because G lenses have no aperture ring. As a result, use the DOF preview simply stops down the aperture to it's smallest setting, even if the camera body is saying that it will use a wider aperture when it takes the shot (the n8008, for example, can use G lenses in P and S modes, where the aperture value for an exposure is calculated by the camera, not user controls). OK, that's acceptable: there's no electronic linkage between the mechanical DOF preview button and the cameras metering system because it wasn't necessary at the time the body was made as G lenses didn't yet exist. The modern DOF preview system is an electronic button that tells that camera to stop down the aperture by reading the aperture setting electronically. This works on G lenses because the camera body "knows" how to set the aperture from the controls. Now, I was reading KR's review of the N75, in which he states that "The depth-of-field preview doesn't work with manual lenses.". If the mechanical DOF preview system simply adjusts the aperture prong to stop down until the mechanical hard stop set by the aperture ring, I don't see why the electronic system can't do the same. eg.: Forgive my nerdiness Is this a limitation only on this particular camera body or do current Nikon DSLRs have the same limitation? EDIT: just found this on Nikon's site for the D700... (emphasis mine) So, it seems that it is more "planned obsolescence" from Nikon. Too bad, there are tons of fantastic old used Nikkor lenses all over the place for cheap.