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SR899 - GSK
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SR899 - GSK - Declaimer Number: 14101
GSK = Geräuscharme Spiegelreflexkamera = low-noise reflex camera
Producer data
Producer Kombinat VEB Pentacon Dresden responsible constructor unknown
development by order of OTS of MfS (Operativ Technischer Sektor des Ministerium für Staatssicherheit=Operative Technical Sector of Ministry of National Security)
production period approximately 1977 no of produced cameras approx. 6000
number 1000-6xxx
Technical properties of the camera
shutter type by two electromagnets controlled vertical-moving metal-blade focal plane shutter exposure time
(possible settings)
B, 1/1, 1/2, 1/4, 1/8, 1/15 1/30, 1/60, 1/125, 1/250,1/500, A, MS, stepless automatic speeds between 1 sec and 1/1000;
view finder fixed eye-level view finder (Pentaprism) with Fresnel lens and microprism range finder as focusing screen mirror fixed semipermeable foil-mirror 
film transport / frame counter
bulletPentacon Loading-System
bulletfixed electric film winder system with electric motor (Dunker Co.) with one release magnet and camera control electronic
bulletcamera controlled by special control-unit which allows distant shutter release with single or serial shots (duration 30 or 60s) with sequences between 3 and 10s stepless
bulletthe control unit have three timers, one for shutter speed, one for duration of serial shots, one for the distance
bulletframe counter at the front of the camera
lens mount M42x1
self timer none battery external 9V-DC-voltage
metering system TTL-metering (25 to 1600 ASA)  flash system X-synchronisation (1/125)
flash indication none aperture reflection into view finder none
general comments
bulletall cameras with additional control unit have a dot behind the serial number
bulletcamera works without control unit using a 9V-DC-voltage
bulletavailable data-back with integrated flash unit with different data sources
bulletavailable 17m-cassette modified from Praktina
bulletavailable grey tone indicator (G1-device, declaimer number 14571) will be connected with the special ocular and release camera shot if brightness has changed in a central field which were checked using photo-diode
bulletavailable also a TV-camera connectable with the camera ocular (only some pieces, no existent variety present in collections)
bulletspecial lenses were used with camera, particularly the following:
bulletSO-3.1 (2.8/35mm) (SO=Sonderoptik=special optic)
bulletSO-3.2 (2.8/50mm)
bulletSO-3.3 (3.5/75mm)
bulletSO-3.4 (3.5/135mm)
bulletSO-2.2B (2.8/180mm Autofocus)
bullettwo versions without fixed foil-mirror
bulletwith SO-2.2B
bulletwith half-format, with bayonet mount for Dokumar-lenses
bulletsee under Vreisleben D, Die Geräuscharme Spiegelreflexkamera (GSK), PhotoDeal 33(2): 28-29, 2001
collection data
Hummel-No none (197X) Kadlubek-No. KWE 2140
body no. 6081 (without additional dot=without control unit) lens no. 2850/88314
lens type SO-3.2 (2.8/50mm) purchase price 500€



under construction

setting knob for shutter speed ocular with closure film speed setting knob

semipermeable, fixed mirror reflecting the focussing screen camera number "6081" without additional dot + frame counter mirror reflection of focussing screen and translucing metal blade shutter
GSK with adapted video camera (picture from Detlev Vreisleben)




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Stand: 10. April 2010