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Bob's Knobs Bob's Knobs for C8 f/10 Secondary with Metric Collimation Screw Threads (not for EdgeHD or Hyperstar) - Camera Concepts & Telescope Solutions
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Newtonian Secondary | Bob's Knobs
Bob's Knobs for Celestron C6-N/NGT, C8-N/NGT and C10-N/NGT Secondary - 30mm
