| Praktica BX
20 with additional flash socket at th pentaprism surface |
| Producer data |
| Producer |
VEB
Pentacon Dresden Betrieb des Kombinates VEB Carl Zeiss Jena |
responsible constructor |
Herbert Welzel, Rolf Seibert |
| production period |
unknown |
no of produced cameras |
as a part of the BX20 series 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 |
 | full format BX20 with additional flash socket at the left side of the
pentaprism |
| possibly for for Bertillon
photography for mug shots |
| both flash sockets working, flash ready signal only for the
traditional socket |
|
| collection data |
| Hummel-No |
235a |
Kadlubek-No. |
unknown |
| body no. |
0049029 |
lens no. |
none |
| lens type |
|
purchase price |
750 € |
| advertising |
|
manual |
|
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