Gift-Cards
Bob's Knobs
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Original price $47.00 - Original price $47.00Original price$47.00$47.00 - $47.00Current price $47.00Bob'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...
View full detailsOriginal price $47.00 - Original price $47.00Original price$47.00$47.00 - $47.00Current price $47.00 -
![Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC) - Astronomy Plus](//astronomyplus.com/cdn/shop/files/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-6-f9-ritchey-cretien-secondary-at6rc-astronomy-plus_152x152.webp?v=1690490819)
Original price $37.75 - Original price $37.75Original price$37.75$37.75 - $37.75Current price $37.75Bob'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...
View full detailsOriginal price $37.75 - Original price $37.75Original price$37.75$37.75 - $37.75Current price $37.75 -
![Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary (AT8RC) - Astronomy Plus](//astronomyplus.com/cdn/shop/files/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-8-f8-ritchey-cretien-secondary-at8rc-astronomy-plus_152x152.webp?v=1690490819)
Original price $37.75 - Original price $37.75Original price$37.75$37.75 - $37.75Current price $37.75Bob'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...
View full detailsOriginal price $37.75 - Original price $37.75Original price$37.75$37.75 - $37.75Current price $37.75 -
Original price $31.00 - Original price $35.00Original price$31.00 - $35.00$31.00 - $35.00Current price $31.00Bob'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...
View full detailsOriginal price $31.00 - Original price $35.00Original price$31.00 - $35.00$31.00 - $35.00Current price $31.00 -
Original price $27.00 - Original price $38.00Original price$27.00 - $38.00$27.00 - $38.00Current price $27.00Bob'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) ...
View full detailsOriginal price $27.00 - Original price $38.00Original price$27.00 - $38.00$27.00 - $38.00Current price $27.00 -
Original price $31.00 - Original price $31.00Original price$31.00$31.00 - $31.00Current price $31.00Bob'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...
View full detailsOriginal price $31.00 - Original price $31.00Original price$31.00$31.00 - $31.00Current price $31.00 -
Original price $27.00 - Original price $38.00Original price$27.00 - $38.00$27.00 - $38.00Current price $27.00Bob'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 ...
View full detailsOriginal price $27.00 - Original price $38.00Original price$27.00 - $38.00$27.00 - $38.00Current price $27.00 -
Original price $31.00 - Original price $38.00Original price$31.00 - $38.00$31.00 - $38.00Current price $31.00Bob'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”...
View full detailsOriginal price $31.00 - Original price $38.00Original price$31.00 - $38.00$31.00 - $38.00Current price $31.00 -
Original price $27.86 - Original price $27.86Original price$27.86$27.86 - $27.86Current price $27.86Bob'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...
View full detailsOriginal price $27.86 - Original price $27.86Original price$27.86$27.86 - $27.86Current price $27.86 -
Original price $27.00 - Original price $47.00Original price$27.00 - $47.00$27.00 - $47.00Current price $27.00Bob'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 ...
View full detailsOriginal price $27.00 - Original price $47.00Original price$27.00 - $47.00$27.00 - $47.00Current price $27.00 -
Original price $34.51 - Original price $34.51Original price$34.51$34.51 - $34.51Current price $34.51Bob'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...
View full detailsOriginal price $34.51 - Original price $34.51Original price$34.51$34.51 - $34.51Current price $34.51 -
Original price $31.00 - Original price $31.00Original price$31.00$31.00 - $31.00Current price $31.00Bob’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...
View full detailsOriginal price $31.00 - Original price $31.00Original price$31.00$31.00 - $31.00Current price $31.00
![Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 6" f/9 Ritchey-Crétien Secondary (AT6RC) - Astronomy Plus](http://astronomyplus.com/cdn/shop/files/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-6-f9-ritchey-cretien-secondary-at6rc-astronomy-plus_152x152.webp?v=1690490819)
![Bob's Knobs for Astro-Tech [also GSO, iOptron, MallinCam, Orion, TPO] 8" f/8 Ritchey-Crétien Secondary (AT8RC) - Astronomy Plus](http://astronomyplus.com/cdn/shop/files/bob-s-knobs-for-astro-tech-also-gso-ioptron-mallincam-orion-tpo-8-f8-ritchey-cretien-secondary-at8rc-astronomy-plus_152x152.webp?v=1690490819)
