![Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC) - Astronomy Plus](http://astronomyplus.com/cdn/shop/files/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-6-f9-ritchey-cretien-secondary-at6rc-astronomy-plus_152x152.webp?v=1690490819)
Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC)
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