Topic
Topic author: Luiz Paracampo
Posted on: 20171104184239
An extraordinary presentation from Alexey T. Pictures follow text.
1 I want to present team mates, as well as all self-made, completely finished, working chamber on the basis of "Zorki-6". In addition to measuring, the camera has other improvements, which increase the convenience of working with it.
And so, in order:
2 TTL metering is collected on a CdS photoresistor. It is located behind the upper flap and is directed towards the curtain. Metering type - central weighted, according to the reflection from a white circle with a diameter of 14 mm, applied to the first curtain.
3 The photoresistor does not interfere even with the rear element of the Jupiter-12 lens.
4 The electronic circuit is assembled on a 4-channel comparator LM339 and CMOS logic CD4093.
5 As indicators - three LEDs "underexposure - normal - overexposure". Simultaneous illumination of two indicators indicates an exposure deviation of 0.5 EV in either direction.
6 The circuit also has the function of indicating the discharge of the battery (blinking of the average LED with a frequency of 2 Hz). The metering is activated - by the half-pressing of the trigger button and after 15 seconds it returns to the sleep mode with practically zero power consumption.
7 The curtains are unfolded by the fabric side to the lens and have sewn bows.
8 The camera has a new viewfinder with frames of 50 mm (actually - a percentage of 15 already) having an increase of about 0.8X.
9 The pressure table has been replaced by a longer one for evenly pressing the film over the entire film channel.
10 In the back cover of the camera, a window is opened for displaying data on the type of film and ISO applied to the cassette. The lock of the back cover is snap-fit, and not pushed by a finger.
11 A shoe with a central contact and an ISO setting wheel
12 Two LR44 batteries are installed in the compartment in the bottom cover
13 The contacts that activate the measurement work are closed from the movement of the trigger spring.
http://rangefinder.ru/club/viewtopic.php?f=9&t=13666
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