INSTRUCTIONS FOR 500mm MIRROR LENS THE MIRROR LENS Compared with refractive lens system, the unique design of the MIRROR LENS gives superior optical performance. It is a compound catadioptric lens system which encompasses a 500mm focal length optical path in a barrel only 7-1 / 4" long. This perfect optical arrangement eliminates chromatic aberration and gives a well-corrected, sharp image over the entire negative or slide. The MIRROR LENS is id eal for sports and nature photography, especi ally when hand-held shooting is required. Distance settings range from 10 feet to infinity. " T ' system ca mera adapters are available for using the MIRROR LENS with most popular 35mm single lens reflex ca meras. Screw the appropriate "T ' adapter onto the rear of the lens and mouht the lens to the camera body in the us ual manner. Tripod mount allows lens to be held by camera. Use of "T" Adapters dose not alter focal distance of lens. LENS SPEED AND DIAPHRAGM The MIRROR LENS has a fixed apertur e of f/8 as this particular lens system dose not require a vari able diaphragm . Exposure is determined by the proper combination of shutter speed and built-in filt ers. Aperture with no filter is f/ 8. filter . An effective aperture of f/ 11 is obtained by use of a 2X neutral density An effective ap erture of f/16 is obtained dy the use of a 4X filter . no neutral density filter is f/8. Remember that aperture with HOW TO OBTAIN PROPER F STOP A ROT A TING DIAPHRAGM having 2X and 4X neutral density filters is built barrel. into the rear of lens F stops are obtained by turning it to the proper position: F 2X 4X 8 Fll Fl6 SKYLIGHT FILTER AND LENS HOOD A skylight filter can be mounted onto the rear of the lens before mounting " T' system adapter. The front of the lens is threaded to accept a 77mm lens hood especially made for the MIRROR LENS. FOCUSING Focusing can be done correctly only with the ground glass portion of the focusing screen, since rangefinder prisms and microgrid screens shadow out with long or slow lenses. requires particular care in focusing. The extremely shallow depth of field No focus compensation is required when using infrared film with the MIRROR LENS because of its catadioptric design. CAUTION This is a precision optical instrument and should be handled with care. Follow accepted procedures when cleaning lens to avoid scratchig optical coating.
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