|
| | Praktica BY design samples
Production period: 1989
Number of Models: 3 ?
Number of produced items: none
responsible constructor: Dr. Jehmlich, Dipl.-Ing. Schultzki
| Hummel-No |
camera-name |
produced items |
| 300* |
Praktica BY20 |
1? |
| 301* |
Praktica BYm |
1? |
* self assigned, number not assigned by Hummel
During the late 1980s an ambitious programme was planned to develop a
tubus camera with autofocus function, DX-coding and multiprogram mode.
Initially two different models were planned:
Praktica BY60 AF1 and BY60 AF2 (Record 778, spoiled originals, Stadtarchiv
Dresden).
Praktica BY60 AF1:
 | 2 exposure programs |
| 2 autofocus programs |
| 4 trigger programs (single picture exposure, serial exposure, 3 picture
series exposur (1 normal exposure, 1 picture +1EV, 1 picture -1EV), self
timer exposure) |
Praktica BY60 AF2:
| 4 exposure programs |
| 4 autofocus programs |
| 4 trigger programs (single picture exposure, serial exposure, 3 picture
series exposur (1 normal exposure, 1 picture +1EV, 1 picture -1EV), self
timer exposure) |
Technical properties (Pentcon technical program number 117):
| LCD-Monitor at the top of the camera with indication of program mode,
exposure time, aperture, battery load, number of picture, ... |
| new DX-decoder (separate developing program from June 1990,
constructor: Fiedler) |
| LED signaling for speed, flash ready signal and programs |
| automatic flash exposure system |
| lenses: 1.8/50, 2.8/20, 4/300 as well as two different Vario-lenses
25-70mm and 70-210mm |
| databack |
| remote control |
| mini-flash system as well as computrized flash |
| adapation of conventional PB-mount lenses |
Comparison of the planned camera with international top cameras:
| Parameter |
BY60 |
international |
| no. of different exposure programs |
4 |
4 |
| autofocus programs |
4 |
4 |
| shutter release programs |
5 |
5 |
| flash programs |
4 |
4 |
| exposures/s (max.) |
2 |
4 |
| shortest shutter spped |
1/2000 |
1/4000 |
According to the results of the market analysis the project Praktica BY60
AF1 was cancelled.
The functional specification document (FSD) was created at 30.11.1989. The
costs of development were estimated with 15,700,000 East German Marks.
The start of development was November of 1989. The end of development was
palnned at August of 1991. The start of serial production was planned for 1994
(K10/0 at 11/1993).
Level of development stage A1 (January 1991) - finished:
| Trade mark right conception |
| realization conception |
Level of development stage A2 (June 1990) - design models finished:
| three design models (possibly marked as BYm, construction drawings of
BYm from March 1991 - Record 591, Stadtarchiv Dresden) |
| three laboratory models |
Level of development stage A3 (May 1991) - not started
| first laboratory models of autofocus lenses from Carl Zeiss Jena |
The development was stopped at 13.Juni 1990 (?) with a financial loss of
23,000,000 East German Mark (Jehmlich 2009).
.
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