| 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 |
 | camera No. 26 on the lens mount |
| handsheet 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€ |
| advertising |
|
manual |
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