Will a nikon f mount fit a nikon d70 camera?
Yes, it will fit. However, you will still need to see if the
lens you have has or does not have features like autofocus or CPU
connectors that will carry all the info that your camera needs...
If it is a Nikon Lens it will work fine. So will others like Sigma,
Tamron and Tokina. Carl Zeiss may not give you all the functions
but will work in manual mode.