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172459 GOI Mir-3 3.5/6.5 cm OB173 %u20ac6.000*prototypeno. 57126053, 1957, condition A/B %u20ac 12.000 %u2013 14.000A very interesting and exceptionally rare early GOI OB173 3.5/65 mm wide-angle prototype, developed in 1957 for the Soviet Salut 6 %u00d7 6 cm medium-format camera. The OB173 represents the prototype stage of what subsequently became the MIR-3 3.5/65 mm, later manufactured by Zavod Arsenal in Kiev as the wide-angle lens for the Salut and subsequent Kiev medium-format camera systems. The prototype is fitted with a non-standard M48mount, apparently intended for testing purposes, rather than the later production camera mount. The offered prototype, Lens No.57126053, is preserved in beautiful, almost mint condition, with clean optics, and comes complete with its matching original caps and original factory wooden box bearing the matching serial number. Of particular interest, the immediately preceding OB173 prototype, Lens No. 57126052, likewise dating from 1957 and accompanied by its matching wooden box, was sold at the 41st Leitz Photographica Auction. An exceptionally rare surviving prototype documenting the early development of one of the principal wide-angle lenses for the Soviet 6 %u00d7 6 cm system.460 GOI Orthodinar-3 2.5/105 mm %u20ac6.000prototypeno. 2868, 1960s, condition A/B %u20ac 12.000 %u2013 14.000Extremely rare and interesting prototype lens covering medium format, intended for technical purposes, in almost mint condition, here professionally adapted for Canon EF, with very good optics, a lens of this type is shown in GOI lens construction book on page 39.06a.461 GOI f. Exakta MTO 8/50cm %u20ac6.000Prototype OB102no. 53035397, 1953, condition A/B %u20ac 10.000 %u2013 12.000A very rare GOI MTO 8/50cm (500 mm f/8) catadioptric telephoto lens from 1953, developed by the Soviet State Optical Institute (GOI) as part of an experimental lens series for a planned SLR camera with Exakta mount. The MTO design is based on Dmitri Maksutov%u2019s mirror-lens principle, combining spherical mirrors witha strongly curved meniscus corrector to achieve a remarkably compact construction for a 500 mm lens. Particularly striking is the deeply concave front element, characteristic of this early Maksutov design. Only a very small number of these GOI prototypes are known to have been produced. The offered lens is preserved in verygood condition, with good optics, and comes with its original lens hood.462 GOI f. M42 Super ZL-1B %u20ac12.000*18/3000 mm prototypeno. 74177, 1974, condition B+ %u20ac 24.000 %u2013 26.000An exceptionally rare prototype mirror telephoto lens developed by the Soviet State Optical Institute (GOI), with only a few examples known to exist. The Super ZL-1B features an extraordinary 3000 mm focal length, a maximum aperture of f/18 and an M42 mount. The front ring is additionally engraved %u2018Ob 539%u2019. It is fittedwith an integrated filter and aperture turret with ND filter andsettings for f/18, f/22 and f/32, as well as a built-in lens hood. Theoffered example is in good condition, with clean and clear optics,and comes with the original front lens cap.463 GOI Variogoir-21 3.5/24-45 mm %u20ac6.000Prototype for Almazno. 83117, 1983, condition B/A %u20ac 12.000 %u2013 14.000An exceptionally rare prototype zoom lens developed by GOI (State Optical Institute, Leningrad) for the Soviet Almaz K-mount SLR system. The Variogoir-21 covers 24%u201345 mm with a constant maximum aperture of f/3.5 and uses an 11-element, 10-group optical construction. The lens is finished in black and shows thetypical hand-finished details and non-standard markings associatedwith GOI experimental optics. To the best of our knowledge, no other example of the Variogoir-21 is presently known. The offeredlens is preserved in very fine original condition, with optics showingsome cleaning marks. A remarkable and very rarely documented example of Soviet experimental zoom-lens development.464 GOMZ Sport Last Batch Outfit %u20ac5.000no. 9469, 1941, condition B+ %u20ac 10.000 %u2013 12.000A very rare late example of the Soviet 35 mm GOMZ %u2018Sport%u2019 SLR, manufactured in Leningrad in 1941 shortly before production was discontinued during the war. Unlike standard %u2018Sport%u2019 cameras, which generally do not bear an individual body number, the present camera is engraved with serial no. 9469 on the chassis, an unusual feature associated with the final production period. Fitted with thecharacteristic vertically travelling metal focal-plane shutter and anI-10 (Industar-10) 3.5/50 mm lens no.16020, a late variant distinguished by the %u2018I-10%u2019 designation. Included is a rare metal front cap engraved %u2018Sport 3.5/50%u2019. Also included is a prototype interchangeable 6.3/100 mm lens for the %u2018Sport%u2019, with matching metal front cap. The lens did not enter series production and represents an intended extension of the camera system. An important ensemble documenting the final development stage of the GOMZ%u2018Sport%u2019 system.