William Optics Red Bahtinov Mask Cover- For WO GT102 and Z103 Telescopes - CPBM-102RD vendor-firefly-books with black gear switching levers)

William Optics Red Bahtinov Mask Cover- For WO GT102 and Z103 Telescopes - CPBM-102RD vendor-firefly-books with black gear switching levers)William Optics Red Bahtinov Mask Cover For WO GT102 and Z103 Telescopes William Optics Bahtinov Focusing Mask and Cover Innovative Design combines Dust Cover and a Bahtinov Mask in one Fits WO GT102 and Z103 Telescopes Clear Acrylic Sheet design provides 92% light transmission Gives the Brightest diffraction spikes for focusing This is a William Optics Bahtinov Focusing Mask Cover made from Acrylic material, which is high in light transmission. This

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