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Praktica BX 20
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 20
Producer data
Producer VEB Pentacon Dresden Betrieb des Kombinates VEB Carl Zeiss Jena responsible constructor Herbert Welzel, Rolf Seibert
production period December 1987 to December 1990 no of produced cameras 201.243
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 signalling (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 colour 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 (12 to 3200 ASA) using electronic diaphragm control (EDC) for measurement with open aperture using a Cadmium sulphide  photo-resistor, auto exposure compensation with +/- two shutter speeds in half steps, automatic exposure system with memory key, battery check facilities flash system X-synchronisation (1/100), accessory shoe at the top of the pentaprism
flash indication yes aperture reflection into view finder yes
general comments version with LEDs in different colours
collection data
Hummel-No 235 Kadlubek-No. KWE 1450
body no. 2270149 lens no. 8089346
lens type Pentacon Prakticar 1:1.8 f=50mm MC purchase price 100€


under construction




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Stand: 10. April 2010