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and the persistence of astronomical filters for decades
Minimal setup
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OA-AF102-FS Maksutov a-button-text {white-space: normalThe OA AF102 FS is a focus assist set designed for the entry level Celestron AstroFi 102 Maksutov Cassegrain Telescope. It comprises of a nested Dust Cap and Bhatinov Mask which replaces the Celestron dust cap. The Bhatinov Mask and Dust Cap fit together as a single unit, ensuring that you'll always have your Bhatinov Mask to hand when you come to focus your AstroFi 102. Simply remove the dust cap from the bhatinov mask to start focussing, replace it
