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The Tri-Bahtinov design was developed by amateur astronomer CY Tan and shared with the astrophotography community on GitHub
Adjustable Carey focus mask for Celestron 9
precise primary alignment
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Lumicon 2 Inch #8 Light Yellow Color Filter D Accessory The Tri-Bahtinov design was developedLumicon 2 Inch #8 Light Yellow Color Filter Lumicon 2 Inch #8 Light Yellow Color Filter is best suited for viewing contrasting features on the Moon, maria on Mars, orange red belts on Jupiter, and dusky details on Neptune and Uranus. Fits any standard 2" eyepiece.
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