Bhatinov Mask
 
Bahtinov mask is a precision tool for astrophotographers, a plate with specific slits placed over a telescope's aperture to create diffraction spikes, making it incredibly easy to achieve pinpoint focus on stars by visually aligning these spikes into a perfect "X" with a central line, removing guesswork and achieving sharp images quickly. Invented by Pavel Bahtinov in 2005, it's an inexpensive way to get sharp focus on DSLRs or dedicated astronomy cameras, essential for capturing detailed deep-sky objects. 
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