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Collimation Knobs & Springs

Items 26 - 50 of 60

Bob's Knobs Meade 16" SCT Collimation Knobs For 3-Screw Secondary - M16-3

SKU: BOB-M16-3
  • These Bob's Knobs Collimation Knobs are designed to fit Meade 16" f/10 Schmidt-Cassegrain telescope models with 3-screw secondary housing like the LX200.
  • Each knob in this set measures 16 mm or 5/8" in diameter and is made of black plastic.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Comes with an Allen wrench for factor collimation screw removal.
  • Meade 16" SCTs with 6-screw secondary housing require a different set of knobs.
$27.00 $20.76

Bob's Knobs Meade 16" SCT Collimation Knobs For 6-Screw Secondary - M16-6

SKU: BOB-M16-6
  • Bob's Knobs Collimation Knobs designed for Meade 16" f/10 Schmidt-Cassegrain telescope models with 6-screw secondary housing such as the LX200
  • These stainless steel collimation knobs measure 19 mm or 3/4" in diameter.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Comes with an Allen wrench for factor collimation screw removal.
  • Meade 16" SCTs with 3 screws on the secondary housing require a different set of knobs.
$27.00

Bob's Knobs Meade 6" SCT f/10 Collimation Knobs For 6-Screw Secondary - M6-6

SKU: BOB-M6-6
  • These Bob's Knobs Collimation Knobs are designed to fit Meade 6" f/10 Schmidt-Cassegrain telescopes such as the LS-6 SC and LS-6 ACF models.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Comes with an Allen wrench for factor collimation screw removal.
  • Installation instructions are included.
$27.00

Bob's Knobs 8" Meade SCT 3-Screw Secondary - M8-3

SKU: BOB-M8-3
  • Measuring 13 mm or 1/2" in diameter, these Bob's Knobs Collimation Knobs are designed to fit Meade 8" f/8 Schmidt-Cassegrains with 3 screws on the secondary housing such as LX5, LX10, LX50, LX90, LX100, LX200, and 2080 model telescopes.
  • Made of black plastic with black anodized aluminum alloy threads.
  • Comes with an Allen wrench for factor collimation screw removal.
  • A set of spacers to be attached to the inside of your telescope's factory dust cover is also provided to ensure that the dust cover fits properly.
$18.00

Bob's Knobs Meade 8" SCT Collimation Knobs For 4-Screw Secondary - M8-4

SKU: BOB-M8-4
  • Measuring 13 mm or 1/2" in diameter, these Bob's Knobs Collimation Knobs are designed to fit Meade 8" f/10 Schmidt-Cassegrain telescopes with 4-screw secondary housing such as the LX90 and LX200 models among others.
  • Made of black plastic with black anodized aluminum alloy threads.
  • Comes with an Allen wrench for factor collimation screw removal.
  • A set of spacers to be attached to the inside of your telescope's factory dust cover is also provided to ensure that the dust cover fits properly.
  • Meade 8" SCTs produced before 2005 with 3 screws on the secondary housing and no 4th screw on the side require a different set of collimation knobs.
$18.00

Bob's Knobs for Meade 8" SCT with 6-Screw Thread - M8-6

SKU: BOB-M8-6
  • Measuring 13 mm or 1/2" in diameter, these Bob's Knobs Collimation Knobs are designed to fit Meade 8" f/10 Schmidt-Cassegrain telescopes with 6 screws on the secondary housing such as the LX90, LX200, LX200R, and LX200ACF models.
  • Made of black plastic with black anodized aluminum alloy threads.
  • Comes with an Allen wrench for factor collimation screw removal.
  • A set of spacers to be attached to the inside of your telescope's factory dust cover is also provided to ensure that the dust cover fits properly.
  • Some Meade 8" SCTs produced before 2005 have 3 screws on the secondary housing and thus require a different set of collimation knobs.
$18.00

Bob's Knobs Meade 8" SCT Widefield f/6.3 Collimation Knobs W/ Dust Cover Spacers - M8WF

SKU: BOB-M8WF
  • These Bob's Knobs Collimation Knobs fit Meade 8" Schmidt-Cassegrain telescope models including the LX6, LX10, LX50, LX100, LX200, and 2080 models with f/6.3 Wide Field marked on the corrector ring.
  • Each knob in this set measures 12 mm or 1/2" in diameter and features stainless steel construction.
  • Comes with an Allen wrench for factor collimation screw removal.
  • A set of spacers to be attached to the inside of your telescope's factory dust cover is also provided to ensure that the dust cover fits properly.
$27.00 $20.76

Bob's Knobs Meade 10" Lightbridge Collimation Knobs For Primary Screws - MLB10pri

SKU: BOB-MLB10PRI
  • These Bob's Knobs Collimation Knobs are designed to fit the primary screws on the Meade 10" f/5 LightBridge Dobsonian reflector telescope.
  • Collimation knobs are 5-point fluted, measure 30 mm in diameter, and have plated steel threads.
  • Knurled lock knobs measure 25 mm in diameter and have stainless steel threads.
  • With these knobs installed, the OTA will still be able to clear the rocker box.
$29.00

Bob's Knobs Meade 12" Lightbridge Collimation Knobs Primary Screws - MLB12PRI

SKU: BOB-MLB12PRI
  • These Bob's Knobs Collimation Knobs are designed to fit the primary screws on the Meade 12" f/5 LightBridge Dobsonian reflector telescope.
  • Collimation knobs are 5-point fluted, measure 30 mm in diameter, and have plated steel threads.
  • Knurled lock knobs measure 25 mm in diameter and have stainless steel threads.
  • With these knobs installed, the OTA will still be able to clear the rocker box.
  • For some 12" LightBridge models, primary collimation knobs already included with the scope make the Bob's Knobs primary collimation knobs unnecessary.
$29.00

Bob's Knobs Meade 8" Lightbridge Collimation Knobs Primary Screws - MLB8PRI

SKU: BOB-MLB8PRI
  • These Bob's Knobs Collimation Knobs are designed to fit the primary screws on the Meade 8" f/6 LightBridge Dobsonian reflector telescope.
  • Collimation knobs are 5-point fluted, measure 30 mm in diameter, and have plated steel threads.
  • Knurled lock knobs measure 25 mm in diameter and have stainless steel threads.
  • With these knobs installed, the OTA will still be able to clear the rocker box.
$29.00

Bob's Knobs Collimation Knobs for Skywatcher 190mm Mak-Newtonian Primary - MN190PRI

SKU: BOB-MN190PRI
  • This Bob's Knobs primary collimation knob set is designed to fit Sky-Watcher 190 mm Maksutov-Newtonian telescopes.
  • Both the collimation knobs and the lock knobs measure 16 mm or 5/8" in diameter and contain stainless steel threads.
  • Set includes black plastic primary collimation knobs and red plastic primary lock knobs.
  • Knobs must be staggered in height due to the factory collimation and locking screws being so close together.
$27.00

Bob's Knobs Collimation Knobs for Skywatcher 190mm Mak-Newtonian Secondary - MN190SEC

SKU: BOB-MN190SEC
  • Measuring 13 mm or 1/2" in diameter, these Bob's Knobs secondary collimation knobs fit SkyWatcher 190 mm Maksutov-Newtonian telescope.
  • Made from black plastic with stainless steel threads.
  • Mounted on long screws in order to clear the secondary lip.
  • Secondary collimation screws from the factory must be removed prior to installation of these knobs.
$22.00

Bob's Knobs SkyWatcher 5" - 10" & C6, C8, and C10; Newtonian Primary Collimation Knobs - SWPRI

SKU: BOB-SWPRI
  • Measuring 16 mm or 5/8" in diameter, these Bob's Knobs Collimation Knobs fit Orion and Sky-Watcher 5", 6", 8", and 10" Newtonian reflector telescopes.
  • Made of black plastic with stainless steel threads.
  • With these knobs installed, the OTA will still be able to clear the rocker box.
  • These knobs are also compatible with Celestron 6", 8", and 10" Newtonian reflectors as well, whether or not they contain GoTo electronics.
  • Knobs must be staggered in height due to the factory collimation and locking screws being so close together.
$27.00

Bob's Knobs Meade Starfinder 10" Collimation Knobs - Primary Screws - MSF10PRI

SKU: BOB-MSF10PRI
  • These primary collimation knobs from Bob's Knobs are designed for the Meade 10" Starfinder reflector telescope.
  • Each knob in this set measures 38 mm or 1 1/2" in diameter.
  • Made of black plastic with stainless steel threads.
  • Knobs are available for the Starfinder primary only as the secondary arrangement interferes with them.
$29.00

Bob's Knobs Meade SNT 6" Collimation Knobs - Secondary Screws - MSN6SEC

SKU: BOB-MSN6SEC
  • Set of collimation knobs from Bob's Knobs designed for the Meade 6" f/5 SNT telescope's secondary mirror.
  • Measuring 13 mm (1/2") in diameter, these knobs feature black plastic construction and stainless steel threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Sitting above the lip of the secondary housing, these knobs are easily accessible.
$22.00 $16.76

Bob's Knobs Meade SNT 8" Collimation Knobs Secondary Screws - MSN8SEC

SKU: BOB-MSN8SEC
  • Set of collimation knobs from Bob's Knobs designed for the Meade 8" f/4 SNT telescope's secondary mirror.
  • Measuring 13 mm (1/2") in diameter, these knobs feature black plastic construction and stainless steel threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Sitting above the lip of the secondary housing, these knobs are easily accessible.
$22.00

Bob's Knobs Meade SNT 10" Collimation Knobs Secondary Screws - MSN10SEC

SKU: BOB-MSN10SEC
  • Set of collimation knobs from Bob's Knobs designed for the Meade 10" f/4 SNT telescope's secondary mirror.
  • Measuring 13 mm (1/2") in diameter, these knobs feature black plastic construction and stainless steel threads.
  • The factory supplied dust cover will fit as per usual with these collimation knobs installed.
  • Sitting above the lip of the secondary housing, these knobs are easily accessible.
$22.00
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.
$22.00
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.
$22.00

Bob's Knobs Collimation Knobs for Orion SkyQuest XT Secondary with 25 mm Screw Length - CNSEC25

SKU: BOB-CNSEC25
  • These Bob's Knobs collimation knobs fit Orion SkyQuest XT Newtonian reflector telescopes with 25 mm long factory collimation screws.
  • Each knob in this set measures 13 mm or 1/2" in diameter.
  • Made from black plastic with stainless steel threads.
  • Compatible with 6", 8", 10", 12", and 16" Orion SkyQuest XT reflectors with 4-vane spider secondary, as well as older model 6", 8", and 10" Orion SkyQuest XT reflectors with 3-vane spider secondary.
$22.00

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.
$22.00
Apertura Secondary Mirror Collimation Knobs

Apertura Secondary Mirror Collimation Knobs - CK

SKU: APT-CK
  • Set of three Apertura Secondary Mirror Collimation Knobs
  • Replaces the secondary collimation screws included with Apertura Dobsonian telescopes
  • Facilitates quick and easy Dobsonian collimation
  • Requires no tools thereby preventing your telescope from acquiring damage
$12.95
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.
$27.00
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.
$18.00
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.
$27.00