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Really interesting small size long lens. It is T mount. Lens in good condition.
Quantaray ad from the Popular Photography magazine (May 1981):
Quantaray 300mm f/5.6 Compact Catadioptric Lens
Tomorrows Technology in Telephoto for Todays Photography
The Quantaray 300mm f/5.6 is an ultra compact, Catadioptric (mirror) telephoto lens which can give your photography that exciting compressed perspective look. Extremely compact and lightweight, this 300mm can be carried and used almost anytime, anywhere. This amazing lens comes complete with neutral density filters to control exposure.
The 300mm Compact Catadioptric lens - it takes your photography across distances at the speed of light.
Min. Focus: 2.5 meter
Filter Size: 34mm rear, 67mm front
Dimensions: 70mm x 66mm
Weight: 260(g)
Quantaray ad from the Popular Photography magazine (August 1982):
The Quantaray Catadioptric (mirror) Lenses are the telephotos for the photographer who demands an extremely compact and lightweight lens for field work. These Quantaray Lenses produce extremely sharp images and each comes with neutral density filters so exposure may be controlled through light levels as well, as shutter speeds.
300mm Technical Specifications: Length: 2.125"; Diameter: 2.63"; Aperture: f/5.6 (2xND/4xND); Min. Focus: 2.5 Meter; Weight: 260 g.
T Mount required for 300 and .
The first of this month's duo is a 300mm f/5.6 Cambron which is an incredibly small 2 9/16-in. long (with necessary T-thread adapter), 2 3/4 in. in diameter and weighs but 9 oz. It focuses to 8 ft., comes with a non-standard rear screw-off skylight filter and case. The front is threaded to accept 67mm filters but the prominent secondary mirror backing at the front might make screwing in most filters a might difficult.
The CPC Phase 2 line was unusual in introducing no zoom lenses. What they did show included a compact 300-mm f/5.6 mirror telephoto, which is sold as part of a kit that includes a 2X matched multiplier (to create a 600mm f/11 combo), 34-mm neutral-density filters (necessary because catadioptric lenses don't have diaphragms), shade, and case. Minimum focus, with or without the multiplier, is 2.5m. Price for the kit is $350; a T-mount lens adapter os $13.50 extra.