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How a Tri-Bahtinov mask works
won’t scratch the corrector plate
Related guides
Newtonian and Dobsonian reflectors only — not for refractors
Farpoint Counterweight Set - 12 Inch Zhumell, Aptura (and other 12" Dobsonians) Astrophotography Filter How a Tri-Bahtinov mask worksFarpoint Counterweight Set 12 Inch Zhumell replace the push or locking screws on the mirror cell, making them a bolt on addition for proper balancing. Farpoint Counterweight Set 12 Inch Zhumell, Aptura, and other 12" Dobsonians Farpoint Counterweight Set 12 Inch Zhumell replace the push or locking screws on the mirror cell, making them a bolt on addition for proper balancing. Machined from stainless steel, this set includes three 1 lb. counterweights
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