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After-sales service: if you have any questions, you can contact us by email, we will spare no effort to help you Broadband blue film: the use of red broadband film for astronomical telescopes can improve the light transmission of the lens, making the light transmission up to 93%, so that the observed places are clear and clear 90° zenith window: the astronomical telescope uses a 90° zenith window to make the observation process more convenient, and the optical lens has high light transmission Angle lock button: the astronomical telescope angle lock button conforms to the habit of finger grip and is easy to lock for viewing