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Celestron Collimation Knobs

Items 1 - 25 of 31

Bob's Knobs Celestron 11" SCT f/10 Metric Collimation Knobs - Black Oxide - C11METBO

SKU: BOB-C11METBO
  • Measuring 12 mm or 1/2" in diameter, these Bob's Knobs Collimation Knobs fit Celestron 11" CPC, EdgeHD, and metric Fastar Schmidt-Cassegrain telescope models.
  • Construction and threads both consist of black oxide steel.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Some telescopes may contain a small plastic cover over the factory collimation screw which will need to be removed before installing these Bob's Knobs collimation knobs.
$20.95

Bob's Knobs Celestron 11" SCT f/10 Collimation Knobs - Standard Secondary - C11STD

SKU: BOB-C11STD
  • Measuring 16 mm or 5/8" in diameter, this Bob's Knobs Collimation Knob set fits Celestron 11" f/10 Schmidt-Cassegrain telescopes with standard collimation and flat secondary housing collimation screw threads.
  • Made from black plastic with black anodized aluminum alloy threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • These collimation knobs are not compatible with CPC 1100 or 11" EdgeHD telescopes.
$20.95

Bob's Knobs Celestron 11" SCT f/10 Fastar Standard Collimation Knobs - C11STDFST

SKU: BOB-C11STDFST
  • Measuring 16 mm or 5/8" in diameter, these Bob's Knobs collimation knobs fit Celestron standard collimation C11 Schmidt-Cassegrain telescopes with "Trifid" rotary cover Fastar secondary housing screw threads.
  • Made from black plastic with stainless steel threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • With these Bob's Knobs Collimation Knobs installed, it is crucial that the rotary secondary cover remain open.
$19.95

Bob's Knobs Celestron 14" SCT f/11 Collimation Knobs - Standard Phillips - C14STDPHI

SKU: BOB-C14STDPHI
  • Measuring 16 mm or 5/8" in diameter, these Bob's Knobs collimation knobs fit Celestron C14 f/11 Schmidt-Cassegrain telescope models with standard thread Phillips factory collimation screws, whether or not they contain Fastar.
  • Made from black plastic with black anodized aluminum alloy threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • These Bob's Knobs Collimation knobs are not compatible with Celestron C14 SCTs with EdgeHD optics.
$20.95 $16.76

Bob's Knobs Celestron 14" SCT f/11 Collimation Knobs Set Screw - C14SET

SKU: BOB-C14SET
  • Measuring 19 mm or 3/4" in diameter, these Bob's Knobs collimation knobs fit Celestron C14 Schmidt-Cassegrain telescopes that have factory headless set-style collimation screws, including those with Trifid Fastar secondary housing.
  • Made from black plastic with black anodized aluminum alloy threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • With these Bob's Knobs Collimation Knobs installed, it is crucial that the rotary secondary cover remain open.
$19.95

Bob's Knobs Celestron 5" SCT f/10 Metric Secondary Collimation Knobs - Black Oxide - C5METBO

SKU: BOB-C5METBO
  • Measuring 12 mm or 1/2" in diameter, these Bob's Knobs collimation knobs fit Celestron 5" f/10 Schmidt-Cassegrain telescopes manufactured in 2006 or later that contain black Phillips factory collimation screws.
  • Construction and threads both consist of black oxide steel.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Some telescopes may contain a small plastic cover over the factory collimation screw which will need to be removed before installing these Bob's Knobs collimation knobs.
$20.95

Bob's Knobs Celestron 5" SCT Collimation Knobs Standard Secondary - C5STD

SKU: BOB-C5STD
  • Measuring 13 mm or 1/2" in diameter, this Bob's Knobs Collimation Knob set fits Celestron 5" f/10 SCTs with silver Phillips, silver Allen, or black Allen factory collimation screws.
  • These collimation do not offer compatibility with telescopes featuring black Phillips factory collimation screws.
  • Made from black plastic with black anodized aluminum alloy threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Some telescopes may contain a small plastic cover over the factory collimation screw which will need to be removed before installing these Bob's Knobs collimation knobs.
$18.95

Bob's Knobs Celestron 6" SCT Collimation Knobs Secondary - Black Oxide - C6BO

SKU: BOB-C6BO
  • These Bob's Knobs Collimation Knobs fit all versions of the Celestron 6" f/10 SCT.
  • Each collimation knob in this set measures 12 mm or 1/2" in diameter.
  • Construction and threads both consist of black oxide steel.
  • The factory supplied dust cover will fit most versions of this design with the exception of some earlier variants with these collimation knobs installed.
$20.95

Bob's Knobs Celestron 8" EdgeHD Collimation Knobs - Black Oxide - C8EDGBO

SKU: BOB-C8EDGBO
  • Measuring 12 mm or 1/2" in diameter, these collimation knobs from Bob's Knobs fit Celestron 8" f/10 Schmidt-Cassegrain telescopes with EdgeHD optics and Fastar.
  • Construction and threads both consist of black oxide steel.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • These collimation knobs are not compatible with 8" SCTs with Fastar secondary that do not have EdgeHD optics.
$20.95

Bob's Knobs Celestron 8" SCT Hyperstar Secondary Collimation Knobs - Black Oxide - C8HYPBO

SKU: BOB-C8HYPBO
  • Measuring 12 mm or 1/2" in diameter, these collimation knobs from Bob's Knobs fit Celestron 8" f/10 Schmidt-Cassegrain telescopes with Hyperstar and metric collimation screws.
  • Construction and threads both consist of black oxide steel.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • These collimation knobs are extra long compared to other metric knobs offered by Bob's Knobs in order to make up for the Hyperstar's countersunk factory screws.
$20.95

Bob's Knobs Celestron 8" SCT Collimation Knobs - Metric - Black Oxide - C8METBO

SKU: BOB-C8METBO
  • Measuring 12 mm or 1/2" in diameter, these Bob's Knobs Collimation Knobs fit Celestron 8" f/10 Schmidt-Cassegrain telescope models made in 2005 or later with Black Phillips factory collimation screws featuring metric threads.
  • Construction and threads both consist of black oxide steel.
  • Some telescopes may contain a small plastic cover over the factory collimation screw which will need to be removed before installing these Bob's Knobs collimation knobs.
  • These knobs are compatible with metric Fastar instruments only and therefore will not work with EdgeHD optics.
$20.95

Bob's Knobs Celestron 8" SCT Collimation Knobs Secondary - C8STD

SKU: BOB-C8STD
  • This Bob's Knobs Collimation Knob set fits Celestron 8" f/10 Schmidt-Cassegrain telescopes models manufactured after 1980 with factory silver, Allen, or Phillips collimation screws, either with Fastar secondary with silver collimation screws or without.
  • Each knob in this set measures 13 mm or 1/2" in diameter.
  • Made from black plastic with black anodized aluminum alloy threads.
  • Some telescopes may contain a small plastic cover over the factory collimation screw which will need to be removed before installing these Bob's Knobs collimation knobs.
  • These collimation knobs are not compatible with Celestron vintage orange optical tubes manufactured before 1980 as well as most telescopes with black Phillips factory collimation screws.
$20.00

Bob's Knobs Celestron 9.25" SCT Fastar Collimation Knobs Secondary - C925FST

SKU: BOB-C925FST
  • Measuring 9.5 mm or 3/8" in diameter, these Bob's Knobs collimation knobs fit Celestron 9.25" f/10 Schmidt-Cassegrain telescopes with "Trifid" Fastar secondary housing.
  • Made from black plastic with stainless steel threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • With these Bob's Knobs Collimation Knobs installed, it is crucial that the rotary secondary cover remain open.
$20.95

Bob's Knobs Celestron 9.25" SCT Secondary Collimation Knobs Metric - Black Oxide - C925METBO

SKU: BOB-C925METBO
  • Measuring 12 mm or 1/2" in diameter, these Bob's Knobs Collimation Knobs fit Celestron 9.25" f/10 CPC Schmidt-Cassegrain telescopes with metric screw threads.
  • Construction and threads both consist of black oxide steel.
  • The factory supplied dust cover will fit per usual with these collimation knobs installed.
  • Some telescopes may contain a small plastic cover over the factory collimation screw which will need to be removed before installing these Bob's Knobs collimation knobs.
  • These knobs are not compatible with CPC 925 telescopes with Trifid Fastar or EdgeHD optics.
$20.95

Bob's Knobs Celestron 9.25" SCT Collimation Knobs Standard Secondary - C925STD

SKU: BOB-C925STD
  • Measuring 16 mm or 5/8" in diameter, this Bob's Knobs collimation knob set fits Celestron 9.25" f/10 Schmidt-Cassegrain telescopes that have standard collimation screw threads.
  • Made from black plastic with black anodized aluminum alloy threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Includes a set of long spacers so that the secondary housing lip can be cleared.
  • Prior to installation, please make sure the knob threads and factory screw threads match.
  • These collimation knobs are not compatible with the CPC 925 or telescopes with EdgeHD optics.
$20.95
Bob's Knobs Celestron C8 Classic Orange Tube Collimation Knobs

Bob's Knobs Collimation Knobs for Celestron Pre-1980 Orange SCT - C8ORG

SKU: BOB-C8ORG
  • Black plastic collimation knobs with black anodized aluminum alloy threads from Bob's Knobs for vintage orange tube Celestron C8 Schmidt-Cassegrain telescope models made before 1980.
  • Each knob in this set measures 13 mm or 1/2" in diameter.
  • Two separate sets of knobs with different screw lengths to suit your telescope are included.
  • The factory supplied dust cover should fit as per usual without coming into contact with these collimation knobs.
$20.95
Bob's Knobs Celestron C14 Secondary Collimation Knobs - Phillips Screws w/Metric Threads

Bob's Knobs Celestron f/11 C14 Secondary Collimation Knobs - Metric Phillips - C14METPHI

SKU: BOB-C14METPHI
  • Measuring 15 mm in diameter, these Bob's Knobs collimation knobs fit Celestron C14 Schmidt-Cassegrain telescope models that feature Phillips collimation screws with factory metric threads, whether they have EdgeHD optics or not.
  • Made from black plastic with stainless steel threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • With these Bob's Knobs Collimation Knobs installed, it is crucial that the rotary secondary cover remain open.
$20.95

Bob's Knobs Celestron 11" SCT f/10 Fastar Metric Collimation Knobs - C11METFST

SKU: BOB-C11METFST
  • Measuring 13 mm in diameter, these Bob's Knobs Collimation Knobs fit Celestron 11" f/10 Schmidt-Cassegrain telescopes with metric thread factory collimation screws and a "Trifid" rotary cover Fastar secondary housing.
  • These knobs will also fit the Celestron C11 SCT with EdgeHD optics, as well as the C11 with Starizona Hyperstar provided it has metric threaded collimation screws.
  • Made from black plastic with stainless steel threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • With these Bob's Knobs Collimation Knobs installed, it is crucial that the rotary secondary cover remain open.
$20.95
Bob's Knobs Celestron 11" SCT f/10 Metric Stainless Steel Knobs

Bob's Knobs Celestron 11" SCT f/10 Metric Stainless Steel Knobs - C11METSS

SKU: BOB-C11METSS
  • These Bob's Knobs Collimation Knobs fit Celestron C11 f/10 SCTs featuring flat secondary housing and metric collimation screw threads.
  • Each knob in this set measures 12 mm or 1/2" in diameter.
  • Construction consists of stainless steel for improved corrosion protection in highly humid conditions.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Prior to installation, please make sure the knob threads and factory screw threads match.
$25.95
Bob's Knobs Celestron 5" SCT f/6 Knobs - C5F6

Bob's Knobs Celestron 5" SCT f/6 Knobs - C5F6

SKU: BOB-C5F6
  • These Bob's Knobs Collimation Knobs only fit the seldom encountered Celestron 5" f/6 telescope.
  • Set of three knobs each measuring 13 mm or 1/2" in diameter.
  • Made from black plastic with black anodized aluminum alloy threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
$16.95
Bob's Knobs Celestron 5" SCT Metric Stainless Steal Knobs - C5METSS

Bob's Knobs Celestron 5" SCT Metric Stainless Steal Knobs - C5METSS

SKU: BOB-C5METSS
  • These Bob's Knobs Collimation Knobs fit Celestron 5" f/10 SCTs manufactured in 2006 or later with black Phillips factory collimation screws.
  • Each knob in this set measures 12 mm or 1/2" in diameter.
  • Construction consists of silver stainless steel for improved corrosion protection in areas with heavy humidity.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Prior to installation, please make sure the knob threads and factory screw threads match.
$25.95
Bob's Knobs Celestron 5" SCT Metric Stainless Steal Knobs - C5METSS

Bob's Knobs Celestron 6" SCT f/10 Stainless Steel Knobs - C6SS

SKU: BOB-C6SS
  • These Bob's Knobs Collimation Knobs fit Celestron 6" f/10 Schmidt-Cassegrain telescopes.
  • Each knob in this set measures 12 mm or 1/2" in diameter.
  • Construction consists of silver stainless steel for improved corrosion protection in areas with heavy humidity.
  • The factory supplied dust cover will fit most versions of this design with the exception of some earlier variants with these collimation knobs installed.
$25.95
Bob's Knobs Celestron 8" EdgeHD Stainless Steel Knobs

Bob's Knobs Celestron 8" EdgeHD Stainless Steel Knobs - C8EDGSS

SKU: BOB-C8EDGSS
  • Measuring 12 mm or 1/2" in diameter, these collimation knobs from Bob's Knobs fit Celestron 8" f/10 Schmidt-Cassegrain telescopes with EdgeHD optics and Fastar.
  • Construction consists of silver stainless steel for improved corrosion protection in areas with heavy humidity.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • These collimation knobs are not compatible with 8" SCTs with Fastar secondary that do not have EdgeHD optics.
$25.95
Bob's Knobs Celestron 8" Hyperstar Stainless Steel Knobs - C8HYPSS

Bob's Knobs Celestron 8" Hyperstar Stainless Steel Knobs - C8HYPSS

SKU: BOB-C8HYPSS
  • These Bob's Knobs collimation knobs fit Celestron 8" f/10 Schmidt-Cassegrain telescopes with Hyperstar and metric collimation screws.
  • Each knob in this set measures 12 mm or 1/2" in diameter.
  • Construction consists of silver stainless steel for improved corrosion protection in areas with heavy humidity.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
$25.95
Bob's Knobs Celestron 8" f/10 Metric Stainless Steal Knobs - C8METSS

Bob's Knobs Celestron 8" f/10 Metric Stainless Steel Knobs - C8METSS

SKU: BOB-C8METSS
  • Measuring 12 mm or 1/2" in diameter, these Bob's Knobs collimation knobs fit Celestron 8" f/10 Schmidt-Cassegrain telescope models manufactured in 2005 or later with black Phillips factory collimation screws that have metric threads.
  • Construction consists of silver stainless steel for improved corrosion protection in areas with heavy humidity.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Prior to installation, please make sure the knob threads and factory screw threads match.
  • These collimation knobs are not compatible with Fastar telescopes that have EdgeHD optics.
$25.95