Mamiya 500mm f/5.6 Telephoto Manual Focus Lens for 645

The 500mm f/5.6 uses ultra-low dispersion glass to give superior resolution in a long telephoto design. It can be matched with the 2X Tele-Extender for use as a 1000mm f/11 lens. It is relatively portable for its focal length and maximum aperture.

Applications include sports, wildlife, fashion, and telephoto landscape photography.
Specifications
Construction 5 Groups/ 6 Elements
Angle of view
F stop range f/5.6-45
Closest Focusing Distance 29' 6.6" / 900cm
Maximum Magnification 1:14.2
Filter Size 105mm
Dimensions (Length x Diameter) 14.1 x 4.5" / 358 x 114mm
Weight 5 lbs. / 2,280 g.