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Here are some quick pics of the Bahtinov Mask that I made to give an idea of its construction. I drew up the mask in Corel Draw with a bar Width of 6mm and an inter-Bar Gap of 6mm based on my focal length of 2160mm.
The mask was printed onto an A4 overhead transparency which was slightly too narrow, although wide enough for the 180mm aperture of the Mewlon.
I cut a strip of camping mat foam (closed cells) and made a ring which just fitted over the end of the OTA. I then cut the transparent gaps out of the transparency film using a steel rule and a Stanley knife and glued the mask to the foam ring.
Where I accidentally scratched the ink during the cutting process, I used a permanent marker pen to blot out the scratches.
Cheers
Dennis
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