R
rick oleson
Guest
That is not necessarily true. In the case where you are aiming the light sensor in from the front, the light source (aluminum foil in the film gate) is about 30mm away from the sensor. At that distance, your sensor may have a field of view of 20 or 30mm. If this is the case, it could be responding to light coming from the aluminum foil over that much distance as the 2mm shutter slit passes across the film gate. This, in a shutter operating at a perfect 1/500 second, would indicate a speed as slow as 1/25 to 1/50 second. Which, by some bizarre and unexplainable coincidence, is exactly the result that you're seeing on your tester.
I'm going to stick my neck out here and speculate that there is nothing whatever wrong with the shutter in your Zorki and that the apparent incorrect readings you're seeing are 100% due to testing error.
I'm going to stick my neck out here and speculate that there is nothing whatever wrong with the shutter in your Zorki and that the apparent incorrect readings you're seeing are 100% due to testing error.