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Depends on the scope. My c8 is easy to use a Bahtinov mask cut from sheet plastic to a pattern created by the generator available online with 5mm bars.
Live view on a DSLR on a bright star shows a pattern easily.
The 100mm refractor is a bit harder and requires a very bright star , full zoomed in live view and a very fine Bahtinov mask to be able see the diffraction pattern.
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