Thanks to both yourself as well as the gentleman who came up with this ingenious creation.
I would like to ask you about the "f/s = 150-200" rule of thumb ... can I assume that it refers to the sum of the slit and the ensuing bar? In other words and using my AP refractor with focal length of 1200 mm, the above rule of thumb yields a value of "s" which is between 6 and 8 mm ... therefore, are the slits one-half of this amount (3-4 mm) and another similar amount for the bar?
As for the angle of the slits for one of the two sides which are not 90 degrees, is this fixed (ex. 20 degrees) or do we have a similar equation for a suggested angle?
Thanks again for your time and attention to this creative tool!
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