Phoenix 500mm f8 for Pentax KYour 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