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Bahtinov masks

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Bahtinov masks are an essential aid for precision focus in astrophotography. In fact they allow you to focus with greater precision than the one obtained watching the star on your computer screen! To do so, after installing the Bahtinov mask in front of the telescope (like a cap), point a bright star and you will notice the light rays that move away from the central star: move the focuser until the central ray is perfectly in the center and you will be in focus! This makes this method faster and more accurate for focusing, in addition being less sensitive to atmospheric turbulence.