Praktica BX 20s last series

Praktica BX 20s last series

Producer data

Producer

Pentacon GmbH

responsible constructor

unknown

production period

June 2001

no of produced cameras

100
numbering from 2001001 to 2001100

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 multicoloured 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