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1. Custom Made Tri-Bahtinov Mask with Cover - for Telescope Focus and Collimation

   Each mask has an oversized finger tab and is white for easy handling in the dark. Credit to Satoru Takagi, C. Y. Tan et al for their work on this design. Sky-Watcher 150P. Sky-Watcher 130P. Sky-Watcher StarQuest 130P.

   eBay

2. Bahtinov Mask, All Sizes, 3 Colours

   eBay

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