All pictures in this gallery were taken with a Kowa PROMINAR 500mm f5.6FL Lens (MF focused)
This lens utilizes one pure fluorite crystal lens and two XD (extra-low-dispersion) lenses to minimize chromatic aberration. It can be used as a high-performance Camera lens and spotting scope.
From the standard specification of "500mm f5.6", it's possible to change the focal length of the lens to 350mm f4 (w/TX07 adapter),500mm f5.6 (w/TX10 adapter) and 850mm f9.6 (w/TX17 adapter).

Special thanks to Kowa Sporting Optics Canada.