High-Quality Bahtinov Mask Focusing Mask For Telescopes Astrophotography GX~ I9

Product Description:

The Bahtinov Mask is a simple but effective tool for achieving precise focus when using a telescope for astrophotography. It works by creating a diffraction pattern that can be used to determine the exact point of focus. The mask is made of durable plastic and is easy to use. Simply place it over the front of your telescope's objective lens and look through the eyepiece. You will see a series of concentric rings, and the point of focus is when the rings are at their sharpest.

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