Originally Posted by
Jim Jones
We used to check them by looking at an old analog TV screen through the shutter. At 1/60 or 1/30 second, you should get a complete picture with no overlap. At lower speeds there is overlap, but sometimes one could figure out how much and calculate the shutter speed. At higher speeds, you get only part of the picture: 1/2 at 1/125 second, 1/4 at 1/250 second, 1/8 at 1/500 second, and 1/16 at 1/1000 second. These speeds should be checked at top, middle, and bottom of the film gate to check for even exposure. I'm relying on distant memory for the above data, and could be wrong.
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