Albinar 500mm f/8 Super Telephoto Mirror Lens for Pentax PK Cameras K-5 K-r x 7 Kr Kx K7 K5 K20D K-m Km K2000 K200D K100D *ist D DS DL DS2 DL2 K110D K10D 500mm f/8 Studio Series Telephoto Manual Mirror Lens Use with manual or automatic SLR & DSLR cameras Multi Coated low-dispersion glass, anti-reflection coating A Multi-coated low-dispersion glass capable of producing sharp, high definition images T-Mount Lens (T2-thread) with Pentax PK adapter