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Praktica BX 21 DX
Praktica BX 20 Praktica BX 20 Pentacon Italia JENAFLEX AM X REVUE BX Praktica BX 20 + flash Praktica BX 10 DX Praktica BX 21 DX Praktica BX 20S (GDR)


Praktica BX 21 DX
Producer data
Producer VEB Pentacon Dresden Betrieb des Kombinates VEB Carl Zeiss Jena responsible constructor Herbert Welzel, Rolf Seibert
production period March 1990 no of produced cameras 29
Technical properties of the camera
shutter type steplessly working electronically controlled vertical-run two-magnet metal-blade focal plane shutter exposure time
(possible settings)
B, steplessly automatic speeds between 40 sec and 1/1000; manually precise speeds of 1/1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250,1/500, 1/1000; mechanical range 1/100 sec
view finder fixed eye-level view finder (Pentaprism, field of view: 95%) with field lens with triple rangefinder wedge, truncated microprism screen, groundglass field, 14 red LEDs for shutter speed signaling (right side of the view-finder image) changes their brightness with brightness of the image, on the left side one LED for flash ready signal, one for locked metered value (AEL) and one for exposure compensation (+/-),  "cocked/no cocked" signal (orange color of the aperture setting reflection window) mirror instant-return mirror
film transport / frame counter single stroke 125° wind-on quick-release lever with 25° stand off position, accepts BX-motor winder, folding crank rewind knob, auto-zeroing frame counter lens mount Praktica-B-mount with EDC (electronic diaphragm control)
self timer mechanically, approx. 10 sec delay, serves also as stop-down lever for depth-of-field checking battery VARTA V28 PX (4xLR44)
metering system TTL-metering (25 to 5000 ASA for automatic film speed entry via DX cartridges; 25, 50, 200 and 400 ISO (ASA) for manual film speed entry) using electronic diaphragm control (EDC) for measurement with open aperture using a Silicon (?) photo-sensor, auto exposure compensation with +/- two shutter speeds in half steps, automatic exposure system with memory key, battery check facilities, TTL-flash system (!) flash system X-synchronization (1/100), accessory shoe at the top of the pentaprism
flash indication yes aperture reflection into view finder yes
general comments
bulletcamera No. 26 on the lens mount
bullethandsheet camera/prototype for BX cameras using DX-encoding
collection data
Hummel-No 237 Kadlubek-No. KWE 1470
body no. none lens no. 1296
lens type Carl Zeiss Jena Macro-Prakticar 1:2.8 f=55mm MC purchase price 1180€


under construction




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Stand: 10. April 2010