A Bahtinov mask tailored for 5" Newtonian telescopes, such as the Sky-Watcher 130P, offers a precise focusing solution similar to the telescope's dust cap. Designed with compatibility in mind, this mask conveniently mounts onto the telescope's front aperture, just like the dust cap. Its design incorporates angled slots that produce diffraction spikes around bright stars. By adjusting the focus until these spikes converge into a central pattern, users can effortlessly achieve optimal focus. This adaptable Bahtinov mask enhances the viewing and imaging experience for a range of 5" Newtonian telescopes, ensuring clear and sharp images of celestial objects.