A Bahtinov mask for a 6" Newtonian telescope, such as the Sky-Watcher 150P Quattro, is a precision tool used to achieve precise focusing during observation and astrophotography. This mask consists of a flat, opaque disk with a series of precisely angled slots arranged in a specific pattern. When placed over the front aperture of the telescope, the mask causes diffraction spikes to appear around bright stars. By adjusting the telescope's focus until these spikes converge into a central pattern, users can achieve optimal focus quickly and accurately. Compatible with various 6" Newtonian telescopes, this Bahtinov mask enhances the viewing and imaging experience by ensuring sharp and clear images of celestial objects.