Used Pentax Super Telephoto 800mm f/4 Takumar Lens for Pentax 67

The Pentax 800mm f/4 lens is the fastest super-telephoto for the Pentax 67 and the fastest lens of its type available for this format. Pentax lenses have been developed using the latest in computer-assisted optical design technology. Lens surfaces are treatedwith Pentax's exclusive Super-Multi-Coating for sharp, high-contrast images. Note! This lens mounts on the external (outer) bayonet of the 67 lens mount Super-fast super-telephoto for the Pentax 67 system This lens has a "pre-set" manual style diaphragm operation,a built-in lens hood, a rotatable tripod collar and rack and pinion type focusing Equivalent 35mm Focal Length 400mm Angle of View @Infinity 6.4½ Filter Size 77mm rear mount 1 Elements/Groups 6/6 Shutter Focal plane shutter built-in to all Pentax model 67 camera bodies. Speeds from 1/1000 to 1 second (4 seconds on 67II), B and T. f/Stop Range f/4 - 45 manual operation with click-stops Flash Synchronization TTL-OTF dedicated flash possible with 67II model in conjunction with optional 67II Hot-shoe Grip and a compatible TTL flash unit. Standard PC socket on body of all 67 camera models for electronic flash connection. Flash sync on all models possible at speeds of 1/30sec and lower. With the Leaf Shutter 165mm f/4 lens, electronic flash sync is possible up to 1/500sec. TTL/OTF flash control IS NOT possible with the leaf shutter, and sync connection is through the PC connection on the lens barrel ONLY. Minimum Focus Distance 20m (65.6') Dimensions 611 x 236 mm (24.5 x 9.44") (LW) Weight 17,700g (39lbs)