Hello BF Users... Thought maybe you could help me throw some light on this lens I have... It's a Nikon Apo lens without a shutter mechanism. As I understand at this point, it's a lens used in graphic arts cameras (stat cameras?) and some photographers use it in 8x10? cameras. How is this done and obviously, how/what shutter mechanism is mated to it? Is it worth using? I'm thinking it was originally meant for a Sinar set-up.... Any info, thanks!