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Bob's Knobs Bob's Knobs for C11 f/10 with “Trifid” Fastar Secondary Housing and Metric Collimation Screw Threads
Part: C11metfst
Fits: Celestron 11” (28 cm) f/10 SCT versions (metal or carbon fiber tube) with metric thread factory collimation screws and "Trifid" rotary cover Fastar secondary housing. Factory collimation screws are black Phillips. These knobs will f
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Bob's Knobs for C11 f/10 with “Trifid” Fastar Secondary Housing and Metric Collimation Screw Threads
$24.95
Bob's Knobs C6BO Celestron 6" SCT f10 Knobs (Black Oxide)
The knobs below will fit almost all versions of the Celestron 6” Schmidt-Cassegrain secondary.
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C6BO Celestron 6" SCT f10 Knobs (Black Oxide)
$24.95
Bob's Knobs Bob's Knobs for C5 f/10 Secondary with Metric Collimation Screw Threads
These knobs will fit only 2006 and later C5 models that have black Phillips factory collimation screws
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Bob's Knobs for C5 f/10 Secondary with Metric Collimation Screw Threads
$24.95
Bob's Knobs Bob's Knobs for C14 f/11 Secondary with Factory Phillips Collimation Screws with Standard Threads
Part: C14stdphi
Fits: Celestron 14” (36 cm) f/11 SCT versions with factory Phillips collimation screws with standard threads, with or without Fastar.
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Bob's Knobs for C14 f/11 Secondary with Factory Phillips Collimation Screws with Standard Threads
$20.00
Bob's Knobs Knobs for SkyWatcher Newtonian Primary with Factory Collimation Screws
Fits: SkyWatcher Newtonian telescopes with factory collimation screws.
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Knobs for SkyWatcher Newtonian Primary with Factory Collimation Screws
$25.95
Bob's Knobs Bob's Knobs for Set Screw Secondary Common Newtonian
Most mass-produced Newtonian telescopes from Celestron, GSO, Hardin Optical, Meade, Orion, Synta, and Zhumell use one of the secondary mirror configurations shown on this page. The photographs and descriptions below will help you determine which knobs to
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Bob's Knobs for Set Screw Secondary Common Newtonian
$20.95
Bob's Knobs M10-6 Meade 10" f/10 SCT 6-Screw Secondary
Bob's Knobs M10-6 Meade 10" f/10 SCT 6-Screw Secondary
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M10-6 Meade 10" f/10 SCT 6-Screw Secondary
$20.00
Bob's Knobs CNsec35 Knobs for Newtonian Secondary Set Screw
Bob's Knobs CNsec35 Knobs for Newtonian Secondary Set Screw
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CNsec35 Knobs for Newtonian Secondary Set Screw
$20.95
Bob's Knobs Bob's Knobs for C9.25 f/10 Secondary (non-Fastar) with Metric Collimation Screw Threads
Part: C9.25metBO (black oxide steel); C9.25metSS (stainless steel)
Fits: Celestron 9.25” (23.5 cm) f/10 SCT versions with metric screw threads (CPC 925). Not for C9.25 with “Trifid” Faster or EdgeHD optics (see Item C below).
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Bob's Knobs for C9.25 f/10 Secondary (non-Fastar) with Metric Collimation Screw Threads
$24.95
Bob's Knobs Bob's Knobs for C11 f/10 with Flat Secondary Housing (non-Fastar) and Metric Collimation Screw Threads
Part: C11metBO (black oxide steel); C11metSS (stainless steel)
Fits: Celestron 11” (28 cm) f/10 SCT versions with flat secondary housing and metric collimation screw threads (most CPC 1100).
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Bob's Knobs for C11 f/10 with Flat Secondary Housing (non-Fastar) and Metric Collimation Screw Threads
$29.00
Bob's Knobs Knobs for Zhumell Z8, Z10, and Z12 Secondary
Fits: Zhumell Z8, Z10, and Z12 telescopes
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Knobs for Zhumell Z8, Z10, and Z12 Secondary
$20.95
Bob's Knobs Knobs for Newtonian 10" Primary Mirrors
Part: MLB10pri
Fits: 10” Newtonian telescopes manufactured by Guan Shen Optical (GSO), including Meade LIghtbridge, Hardin Optical, and Zhumell.
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Knobs for Newtonian 10" Primary Mirrors
$29.95
Bob's Knobs Knobs for Common Newtonian 12" Primary Mirror
Part: MLB12pri
Fits: 12” Newtonian telescopes manufactured by Guan Shen Optical (GSO), including Meade LIghtbridge, Hardin Optical, and Zhumell.
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Knobs for Common Newtonian 12" Primary Mirror
$29.95
Bob's Knobs Bob's Knobs for Meade 8” f/10 with 6-Screw Secondary
Part: M8-6
Fits: Meade 8” (20 cm) f/10 SCT versions with six screws on the secondary housing (LX90, LX200, LX200ACF, LX200R, LS-8 SC and ACF, LT-8 SC and ACF, others). The inner screws are for collimation.
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Bob's Knobs for Meade 8” f/10 with 6-Screw Secondary
$20.00
Bob's Knobs Bob's Knobs for Meade 6” f/10 6-Screw Secondary
Part: M6-6
Fits: Meade 6” (15 cm) f/10 SCT versions (ETX-LS, LS-6 SC and ACF, LT-6 SC and ACF)
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Bob's Knobs for Meade 6” f/10 6-Screw Secondary
$29.95
Bob's Knobs KNOBS FOR MEADE 16 inch (20 cm) f/10 SCT WITH 6-SCREW SECONDARY
Knobs for Meade 16” f/8 ACF and f/10 with 6-Screw Secondary
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KNOBS FOR MEADE 16 inch (20 cm) f/10 SCT WITH 6-SCREW SECONDARY
$29.95
Bob's Knobs KNOBS FOR MEADE 16 inch (41 cm) f/10 SCT WITH 3-SCREW SECONDARY
Knobs for Meade 16” f/10 with 3-Screw Secondary
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KNOBS FOR MEADE 16 inch (41 cm) f/10 SCT WITH 3-SCREW SECONDARY
$29.95
Bob's Knobs KNOBS FOR MEADE 14 inch (36 cm) f/10 SCT 6-SCREW SECONDARY WITH EXPOSED FACTORY COLLIMATION SCREWS
M14-6e
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KNOBS FOR MEADE 14 inch (36 cm) f/10 SCT 6-SCREW SECONDARY WITH EXPOSED FACTORY COLLIMATION SCREWS
$20.00
Bob's Knobs Bob's Knobs for Meade 10" f/10 SCT 3-Screw Secondary
Meade 10” (25 cm) f/10 SCT versions with three screws on the secondary housing (2120, LX10, LX50, LX90, LX100, LX200, others)
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Bob's Knobs for Meade 10" f/10 SCT 3-Screw Secondary
$20.00
Bob's Knobs Bob's Knobs for C9.25 f/10 Secondary with Standard Collimation Screw Threads
Part: C9.25std
Fits: Celestron 9.25” (23.5 cm) f/10 SCT versions with standard collimation screw threads (not for CPC 925 or EdgeHD).
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Bob's Knobs for C9.25 f/10 Secondary with Standard Collimation Screw Threads
$20.00
Bob's Knobs Bob's Knobs for C9.25 f/10 Secondary with Metric Collimation Screw Threads and “Trifid” Fastar Housing
Part: C9.25fst
Fits: Celestron 9.25” (23.5 cm) f/10 SCT versions with "Trifid" Fastar secondary housing
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Bob's Knobs for C9.25 f/10 Secondary with Metric Collimation Screw Threads and “Trifid” Fastar Housing
$24.95
Bob's Knobs Bob's Knobs for C8 f/10 Post-1980 Secondary with Standard Collimation Screw Threads
Part: C8std
Fits: Celestron 8” (20 cm) f/10 post-1980 SCT with factory Allen or silver Phillips collimation screws, with or without Fastar secondary with silver collimation screws (C8 black, or gray; Ultima 2000; NexStar 8; others). This includes the pos
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Bob's Knobs for C8 f/10 Post-1980 Secondary with Standard Collimation Screw Threads
$20.00
Bob's Knobs Bob's Knobs for C14 f/11 Secondary with Factory Phillips Collimation Screws with Metric Threads
Part: C14metphi
Fits: Celestron 14” (36 cm) f/11 SCT versions with metric thread factory Phillips collimation screws with Fastar and with or without EdgeHD optics.
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Bob's Knobs for C14 f/11 Secondary with Factory Phillips Collimation Screws with Metric Threads
$24.95
Bob's Knobs Bob's Knobs for C14 f/11 Secondary with Factory Headless Set-Style Collimation Screws
Part: C14set
Fits: Celestron 14” (36 cm) f/11 SCT versions with factory headless set-style (Allen or slotted) collimation screws
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Bob's Knobs for C14 f/11 Secondary with Factory Headless Set-Style Collimation Screws
$24.95