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Praktica BX 20S black/green
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Praktica BX 20S green
Producer data
Producer Jos. Schneider GmbH, since 1998 Pentacon GmbH responsible constructor unknown
production period unknown no of produced cameras approx. 155
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, 16 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, "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 (25 to 5000 ASA for automatic film speed entry via DX cartridges, 25 to 400ASA for manual film speed entry) using electronic diaphragm control (EDC) for measurement with open aperture using a Silicon photo-sensor, auto exposure compensation, TTL-flash system (!), 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 black/green casing
collection data
Hummel-No 243* Kadlubek-No. KWE 4030
body no. 4126807 lens no. 607638
lens type Prakticar Auto Zoom 1:4.5 70-210mm Macro MC purchase price 550€
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Stand: 10. April 2010