Mặt nạ Tri-Bahtinov cho Celestron C6

The standard Bahtinov mask is one of the most useful tools for focusing used in astrophotography. However, it can be made even more useful by making it three-fold symmetric, i.e. to add two more Bahtinov masks. The result is what's called a "Tri-Bahtinov" mask. The Tri-Bahtinov mask allows you to check whether the SCT is well collimated. Read More about the Tri-Bahtinov mask in the highly detailed guide by C.Y. Tan.

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