Tri bahtinov mask black colour
A TriBahtinov mask operates under the same principle as the Bahtinov mask for focusing and adds the ability to collimate scopes with collimatable optics.
The design is based on Cytan’s idea, documented on his Github site here where you can see more details and images of this item in use.
The mask has a raised center for an easy grip and comes in three sections that snap fit together and can be taken apart for easier storag.
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