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Bob’s Knobs

the bob's knob are renowned in the world of astronomy. They are the best!

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Bob's Knobs for Celestron 8" SCT - Astronomy Plus
$27.00 - $38.00
$27.00 - $38.00
$27.00 - $38.00
$27.00

Bob's Knobs for Celestron 8" SCT

Bob's Knobs for Celestron 8" SCT A. Knobs for C8 f/10 Pre-1980 Orange-Tube Secondary Part: C8orgFits: Pre-1980 Celestron 8” (20 cm) f/10 SCT with ...

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$27.00 - $38.00
$27.00 - $38.00
$27.00 - $38.00
$27.00
Bob's Knobs for Common Newtonian Secondary - Astronomy Plus
$27.86 - $27.86
$27.86
$27.86 - $27.86
$27.86

Bob's Knobs for Common Newtonian Secondary

Bob's Knobs for Common Newtonian Secondary Fits: Celestron C8-N/NGT, C10-N/NGT, Orion Astrograph, Astroview, SkyQuest XX and XT, Skyview, SkyWatche...

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$27.86 - $27.86
$27.86
$27.86 - $27.86
$27.86
Bob's Knobs for Celestron 6” SCT Black Oxide (C6BO) - Astronomy Plus
$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00

Bob's Knobs for Celestron 6” SCT Black Oxide (C6BO)

Bob's Knobs for Celestron 6” SCT Black Oxide The knobs below will fit almost all versions of the Celestron 6” Schmidt-Cassegrain secondary. Price i...

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$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00
Bob's Knobs for Meade SCT - Astronomy Plus
$27.00 - $47.00
$27.00 - $47.00
$27.00 - $47.00
$27.00

Bob's Knobs for Meade SCT

Bob's Knobs for Meade SCT A. Knobs for Meade 12” f/10 with 3-Screw or 4-Screw Secondary Part: M12-3Fits: Meade 12” (30 cm) f/10 SCT versions with ...

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$27.00 - $47.00
$27.00 - $47.00
$27.00 - $47.00
$27.00
$31.00 - $35.00
$31.00 - $35.00
$31.00 - $35.00
$31.00

Bob's Knobs for Celestron 11" SCT

Bob's Knobs for Celestron 11" SCT We offer knobs for all versions of the Celestron 11” f/10 Schmidt-Cassegrain secondary with either standard or me...

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$31.00 - $35.00
$31.00 - $35.00
$31.00 - $35.00
$31.00
$47.00 - $47.00
$47.00
$47.00 - $47.00
$47.00

Bob's Knob for Common Newtonian Primary

Bob's Knob for Common Newtonian Primary Common Newtonian-style telescope primary configurations: These knobs will fit most Newtonian reflectors mad...

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$47.00 - $47.00
$47.00
$47.00 - $47.00
$47.00
Bob's Knobs for Celestron 5" SCT - Astronomy Plus
$27.00 - $38.00
$27.00 - $38.00
$27.00 - $38.00
$27.00

Bob's Knobs for Celestron 5" SCT

Bob's Knobs for Celestron 5" SCT A. Knobs for C5 f/10 Secondary with Standard Collimation Screw ThreadsPart Part: C5stdFits: Celestron 5” (13 cm) ...

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$27.00 - $38.00
$27.00 - $38.00
$27.00 - $38.00
$27.00
Bob's Knobs for Celestron 9.25” SCT - Astronomy Plus
Bob's Knobs for Celestron 9.25” SCT - Astronomy Plus
$31.00 - $38.00
$31.00 - $38.00
$31.00 - $38.00
$31.00

Bob's Knobs for Celestron 9.25” SCT

Bob's Knobs for Celestron 9.25” SCT  A. Knobs for C9.25 f/10 Secondary with Standard Collimation Screw Threads Part: C9.25stdFits: Celestron 9.25”...

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$31.00 - $38.00
$31.00 - $38.00
$31.00 - $38.00
$31.00
Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary (AT8RC) - Astronomy Plus
$37.75 - $37.75
$37.75
$37.75 - $37.75
$37.75

Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary (AT8RC)

Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary Fits: Astro-Tech, GSO, iOptron, MallinCam, O...

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$37.75 - $37.75
$37.75
$37.75 - $37.75
$37.75
Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC) - Astronomy Plus
$37.75 - $37.75
$37.75
$37.75 - $37.75
$37.75

Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC)

Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary Fits: Astro-Tech, GSO, iOptron, MallinCam, O...

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$37.75 - $37.75
$37.75
$37.75 - $37.75
$37.75
Bob’s Knobs for Celestron 14″ SCT (C14metphi) - Astronomy Plus
$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00

Bob’s Knobs for Celestron 14″ SCT (C14metphi)

Bob’s Knobs for Celestron 14″ SCT Fits: Celestron 14” (36 cm) f/11 SCT versions with factory headless set-style (Allen or slotted) collimation scre...

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$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00
Bob's Knobs for SkyWatcher & Celestron Newtonian Primary (SWpri) - Astronomy Plus
$34.51 - $34.51
$34.51
$34.51 - $34.51
$34.51

Bob's Knobs for SkyWatcher & Celestron Newtonian Primary (SWpri)

Bob's Knobs for SkyWatcher & Celestron Newtonian Primary Fits: SkyWatcher Newtonian telescopes with factory collimation screws.Primary collima...

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$34.51 - $34.51
$34.51
$34.51 - $34.51
$34.51
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