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1 comment of this product found across Reddit:
Telnet_to_the_Mind /r/AskAstrophotography
7 points
1970-01-19 14:33:34.507 +0000 UTC

I have one of these and it seems to help.

https://www.amazon.com/Astromania-Bahtinov-Mask-Focusing-Telescopes/dp/B01MEGIA85/ref=sr_1_2?dchild=1&keywords=bahtinov+mask&qid=1607614494&sr=8-2

I affectionaly call them 'bhatman mask'. You put it on the lens/scope, focus until you see a very sharp three dotted diamond image, and that means you're in focus.