Bob's Knobs for Celestron

Bob's Knobs

  • Celestron C5 f/10 with Standard Threads
  • Celestron C5 f/10 with Standard Threads

  • These knobs will fit all C5 models made prior to 2006, and all 2006 and later models EXCEPT those with black Phillips factory collimation screws. read more...
  • Our price: $16.95

  • Celestron C5 f/10 with Metric Threads
  • Celestron C5 f/10 with Metric Threads

  • These knobs will fit only 2006 and later Celestron C5 models that have black Phillips factory collimation screws. read more...
  • Our price: $20.95

  • Celestron C6 f/10 with Metric Threads
  • Celestron C6 f/10 with Metric Threads

  • The knobs will fit all versions of the Celestron 6” Schmidt-Cassegrain secondary. read more...
  • Our price: $20.95

  • Celestron C8 f/10 Post-1980 with Standard Threads
  • Celestron C8 f/10 Post-1980 with Standard Threads

  • These knobs fit post-1980 Celestron C8 with factory Allen or silver Phillips collimation screws, with or without Fastar secondary with silver collimation screws. read more...
  • Our price: $16.95

  • Celestron C8 f/10 with Metric Threads
  • Celestron C8 f/10 with Metric Threads

  • These knobs fit most Celestron C8 made in 2005 and later with black Phillips factory collimation screws; not for Fastar or EdgeHD models. read more...
  • Our price: $20.95

  • Celestron C8 f/10 EdgeHD
  • Celestron C8 f/10 EdgeHD

  • These knobs will fit only the Celestron 8” EdgeHD optics with the Fastar secondary. read more...
  • Our price: $20.95

  • Celestron C9.25 f/10 with Standard Threads
  • Celestron C9.25 f/10 with Standard Threads

  • These knobs fit Celestron C9.25 optical tubes equipped with silver Phillips collimation screws. read more...
  • Our price: $16.95

  • Celestron 9.25 f/10 with Metric Threads
  • Celestron 9.25 f/10 with Metric Threads

  • Bob's Knobs allow you to collimate your Celestron Schmidt-Cassedgrain or EdgeHD optics without tools. read more...
  • Our price: $20.95

  • Celestron C9.25 f/10 EdgeHD and Fastar
  • Celestron C9.25 f/10 EdgeHD and Fastar

  • These knobs fit Celestron C9.25” f/10 EdgeHD and Fastar optical tubes with the triffid style secondary mirror housing. read more...
  • Our price: $22.95

  • Celestron C11 f/10 with Flat Secondary and Standard Threads
  • Celestron C11 f/10 with Flat Secondary and Standard Threads

  • Fits Celestron C11 f/10 SCT versions with flat secondary housing and standard collimation screw threads (not for CPC 1100 or EdgeHD). read more...
  • Our price: $19.95

  • Celestron C11 f/10 with Flat Secondary and Metric Threads
  • Celestron C11 f/10 with Flat Secondary and Metric Threads

  • Fits Celestron C11 f/10 SCT versions with flat secondary housing and black Phillips collimation screws. read more...
  • Our price: $20.95

  • Celestron C11 f/10 Fastar with Standard Threads
  • Celestron C11 f/10 Fastar with Standard Threads

  • Fits Celestron C11 with Fastar secondary housing and silver Phillips factory collimation screws. read more...
  • Our price: $19.95

  • Celestron C11 f/10 Fastar with Metric Threads
  • Celestron C11 f/10 Fastar with Metric Threads

  • Fits Celestron C11 with Fastar secondary housing and black Phillips factory collimation screws. read more...
  • Our price: $22.95


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