This thing is absolutely AMAZING! I have an F/5.95 110mm refractor with a 0.8x FR. I guestimated the spacing of the mask to be 10mm or 5mm wide slits. Quickly drew one up in the drawing program mentioned above, printed and cut out the slits. I glued the paper mask on a piece of foam board with a hole that turned out to be bigger than the dew shield so the resulting pattern doesn't center. Bam! focus patter is exactly as 'advertised'. Instead of spending 20 minutes with Neb2's HFR focus with numbers jumping all over the place I was focused in about 2 minutes.
My advise: don't worry about the details. Make one from cheap material and try it out.
-------------------- Best,
Sander
C11-HyperStar on Atlas EQ-Q driven by EQMOD
William Optics M110 With FR-III/TRF-2008
DS2090 guide scope
QHY-8, DSI-Pro and DSI cameras
watec 802h video camera with KIWI OSD
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Re: Revolutionary new way of focusing! No less!
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