Phoenix 500mm f8 for Pentax K  type_On Camera Flash 5 for Mamiya 645 is

5 for Mamiya 645 is a good quality manual focus short telephoto lens for the Mamiya 645 system

with a camera plate about 3cm across

whether you use it for a camera or something else

8 ED PRO is a fast

Phoenix 500mm f8 for Pentax K &nbsptype_On Camera Flash 5 for Mamiya 645 isYour typical "long tube with a couple of elements in it" telephoto, this simple lens actually does a pretty decent job, if you don't mind the length (it's about 32cm long.) This lens is fully manual, including aperture stop down; the upside is that while it's provided with a Pentax K mount, it's actually an interchangeable T mount lens, so if you want to move it to another camera system, it's just a simple matter of switching out the mount adapter. In