Thanks all for your reply,
Vaughn I have a 24 apo artar,thanks for you offer, a friend of mine is looking for a lens of that focal, when I saw him I'll give him this information,
actually I'm seriously thinking to buy the Apo Nikkor 760 f11, a bit better to focusing than the f14.
I am presently borrowing a RD 24" Artar -- definitely a more practical lens than the 600mm Apo-Ronar for field use. But then I am just using a wimpy little 8x10
PM me if your friend is interested, or if you would like more info on it for your friend.
At least with LF landscape, a bad day of photography can still be a good day of exercise.