Bahtinov mask for NexStar SLT130
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A Bahtinov mask for a Celestron Nexstar SLT130 or any other 151mm wide ID telescope (optimised for ~650mm focal length)
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- Physics & Astronomy
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- Creative Commons — Attribution
I'm uploading a few models that I've made myself because I could not find or was not completely happy with what I could find online.
This is a Bahtinov mask for a Nexstar 130SLT. I created the design after finding a couple online that said they would fit, but were too big or too small. I can guarantee this one fits snug in an 130SLT.
The design fits an inner diameter of a 151mm, however there is a slight (2 degree) draft on the six tabs that hold it in, meaning that it can likely fit a 152mm or 153mm ID tube.
For those whom have never used a Bahtinov mask, and are wondering what on earth this is all about, they're a great way to ensure correct focus on planets and stars. It would have been really clever of me to include my own photos during the focusing process, but it's bucketing down outside so you'll have to settle for the one I grabbed from the BBC website.