Bathinov mask Sky Watcher 750mm 150P

It's a Bahitnov mask made specifically for Sky watcher 150/750P but it probably will work fine on a similar telescope. cap is made for a tube of inside diameter of 170mm and a focal length of 750mm but you could probably get away with a bit different FL. tell me what telescope did you use it on and it worked so i can right it down here. What's a Bathinov mask? It's a difraction grating used to fine tune the focus on a star with a telescope. https://en.wikipedia.org/wiki/Bahtinov_mask so far com…

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