Can someone give information as to the differences between the Fujinon 300 A and 300 C? I would be using it on a 5x7. How does performance compare and how would it compare to the Nikkor M 300? I don't do very much landscape but more documentary work. At the moment I have a 300 Symmar and 14 and 19 Red Dots but all three are rather large either due to #4 Ilex shutters or just the size of the 300 Symmar. Size is more of a factor than speed.

Thanks!