Bahtinov Mask for Celestron 6SE
thingiverse
I just had to see for myself how well these things worked and I have to admit that I was blown away. This has to be the easiest and most affordable way to get perfect focus on a telescope. Designed so that it fits under the dust cover when stored but can be easily removed or rotated. Modeled this based on a PDF downloaded from a no longer active online generator. I don't fully understand the design limitations but I tried to find one that was created for a tube that match my specs the closest and I can confirm that it works very well. Inner Diameter: 2.26" Outer Diameter: 6.625
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