Not sure it makes any difference as I got a bit lost in your calculations but you seem to be making assumptions about the curtain speed, and hence the slit width, which may not be accurate.
The slit width and curtain transit time values are specified in the service literature for the cameras. However, most cameras (in which the speed and slit width are not specified) will be similar due to similar construction.
In the case of the cameras I need to test, the Film Gate is measured to be 36mm.
The X-synch Speed is 1/60th. Therefore the shutter curtains need to cross the film gate at 36mm per 1/60th of a second or 2160mm/sec to achieve a correct exposure to the film.
I'm not very talented with soldering, but interested to buy one of these made up can they be bought?
This post shows the schematic and how I wired it. In fact there are three different schematics that all do the same thing. I assembled mine with parts I had laying around. I used a buss bar. Currently mine is disassembled. Next time I build it I might make it more permanent.
Shutter Speed Testing Focal Plane Shutters
I just finished evaluating some focal plane shutters and wanted to share the information as I found very little on this topic from the internet. Before building the tester, one needs to know which information is needed. For a focal plane shutter, the fast speeds need special consideration...www.photrio.com
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