Just a bit of trivia to those interested in this sort of thing. It seems as though Steve Winter, a photographer for Natl. Geographic, has a Pentax F*300mm f4.5 mounted to an unknown(I can't tell what it is anyway) body in the July 2002 Natl. Geographic. It is a pic in the "Behind the Scenes" section. The title of the article is "Curious as Cats" about tracking jaguars in Belize with researcher Carolyn Miller.
Nice to see a Pentax at work in a magazine heavy with Canon and Nikon advertisements. Robert
