Thread: 2" filter with pinhole for laser collimating with barlow?
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Old 09-01-2013, 09:20 PM
gb_astro
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Join Date: Mar 2008
Location: Sydney
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Quote:
Originally Posted by mark3d View Post
I figure I'll buy a cheap 2" filter and stick a paper disc to that. Hopefully it ends up being somewhat professional.
Mark, what's the point of directing a barlowed laser through a pin hole?

gb.
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