AT72ED Bahtinov mask
thingiverse
Here is a rewritten version of the original text. You simply need to attach a Bahtinov mask to your Astro-Tech AT72ED telescope. Now, all you have to do is carefully adjust the focus on your scope until a faint star begins to take shape like a capital "Z" or an upside-down "J". Once that happens, congratulations! You are now properly focused.
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