Is there any reason why Nikon hasn't implemented this feature? Are they ever going to implement it into the D300 firmware? Or is this Nikon's way of separating the D300/D3 bodies? Will the D700 have a higher minimum shutter speed other than 1/250th? Reason I ask, because this feature is really useful on the telephoto range when you want to lock in your aperture, without your shutter speed going below your focal length (ex: 500mm lens, 1/500th shutter). I know, I can just switch to manual mode, but I'm quite fond of aperture priority, in fact 80% of my shots are done in this mode!