Nikon D300 User Manual page 711

moving, and how fast (in frames per second, or FPS) it
captures the images.
Of course, if you want to, you can turn AF off completely and
simply use Manual focus. This comes in handy when you
decide to use older non-CPU Nikkor manual-focus lenses,
such as the excellent AI/AI-S prime and zoom lenses of
yesteryear and the few primes that are available new.
In fact, one of the important features of the near-professional
D300(S) is the fact that the camera will happily use older
lenses. Many of us have our old favorites, such as the AI-S
Nikkor 105mm f/2.5 portrait lens or the AI-S 35mm f/2. We
can use AF/ AF-S lenses or virtually any of the F-Mount AI/
AI-S lenses. Do not attempt to mount any of the non-AI
manual focus lenses from the late 1960s and early 1970s. This
type of lens can damage the camera's aperture ring prong.
711