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We wish you Happy Holidays! / Check our Holidays Schedule. Order fulfillment may be a bit delayed during Holidays Vacations./ Free Shipping for orders over $500* Some exceptions may apply.

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

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

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 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

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

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 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

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 Celestron 11" SCT - Astronomy Plus
Bob's Knobs for Celestron 11" SCT - Astronomy Plus
$31.00 - $35.00
$31.00 - $35.00
$31.00 - $35.00
$31.00

Bob's Knobs for Celestron 11" SCT

Bob's Knobs

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
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

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
$54.00 - $54.00
$54.00
$54.00 - $54.00
$54.00

Bob's Knobs for MEADE 16” (41 cm) SCT

Bob's Knobs

Bob's Knobs for MEADE 16” (41 cm) SCT We offer knobs for all versions of the Meade 16” f/10 Schmidt-Cassegrain secondary, including those with thre...

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$54.00 - $54.00
$54.00
$54.00 - $54.00
$54.00
$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00

Bob's Knobs for MEADE 14” (36 cm) SCT

Bob's Knobs

Bob's Knobs for MEADE 14” (36 cm) SCT We offer knobs for the Meade 14” f/10 (Item A) and f/8 (Item B) Schmidt-Cassegrain secondary with exposed col...

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$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00

Bob's knobs for MEADE 12” (30 cm) SCT

Bob's Knobs

Bob's knobs for MEADE 12” (30 cm) SCT We offer knobs for all versions of the Meade 12” f/10 and f/8 Schmidt-Cassegrain secondary, including those w...

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

Bob's Knobs for MEADE 10” (25 cm) SCT

Bob's Knobs

Bob's Knobs for MEADE 10” (25 cm) SCT We offer knobs for all versions of the Meade 10” f/10 and f/6.3 Schmidt-Cassegrain secondary, including those...

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

Bob's Knobs for MEADE 8” (20 cm) SCT

Bob's Knobs

Bob's Knobs for MEADE 8” (20 cm) SCT We offer knobs for all versions of the Meade 8” f/10 and f/6.3 Schmidt-Cassegrain secondary, including those w...

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$27.00 - $47.00
$27.00 - $47.00
$27.00 - $47.00
$27.00
$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00

Bob's Knobs for Meade 6" SCT

Bob's Knobs

Bob's Knobs for Meade 6" SCT The knobs below will fit all versions of the Meade 6” Schmidt-Cassegrain secondary. Price is for a complete set of kno...

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$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00
Bob's Knob for Common Newtonian Primary - Astronomy Plus
Bob's Knob for Common Newtonian Primary - Astronomy Plus
$47.00 - $47.00
$47.00
$47.00 - $47.00
$47.00

Bob's Knob for Common Newtonian Primary

Bob's Knobs

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 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

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

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 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

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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