We offer knobs for all versions of the Celestron 14” f/11 Schmidt-Cassegrain secondary with Allen collimation screws, or either standard or metric Phillips collimation screws. Select knobs for your telescope from the list below. Please use care to select the correct knobs for your telescope. Each knob set is different and they are not interchangeable. Price is for a complete set of knobs.
Special Note: The Celestron 14” SCT uses either standard 6-32 or metric M3 collimation screws. Headless set-style and silver Phillips factory collimation screws have standard threads. Generally black Phillips collimation screws have metric threads but a few have standard threads. If you order knobs with the wrong screws, contact us using the link at the bottom of this page for return instructions.
A. 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
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes:
- These knobs will also fit the Celestron 14” SCT with “Trifid” Fastar secondary and headless set-style collimation screws. The rotary secondary cover must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
- The factory dust cover will fit normally with Bob’s Knobs installed.
- Do not adjust the center screw if present; this is the secondary pivot screw.
$22.95
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B. 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.
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Black anodized aluminum alloy
Notes:
- See the special note above for information on standard and metric threads.
- The factory dust cover will fit normally with Bob's Knobs installed.
- If your telescope has a rotary secondary cover, it must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
- Our knobs cannot protrude above the Trifid-style rotary cover or they will interfere with the factory dust cover. For better knob access, you can peel off the vinyl escutcheon and remove this cover or simply access the knobs partly from the side.
$22.95
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C. 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.
Knobs: Black plastic, 15 mm (5/8”) diameter
Threads: Black oxide steel
Notes:
- See the special note above for information on standard and metric threads.
- Collimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.
- The factory dust cover will fit normally with Bob's Knobs installed.
- If your telescope has a rotary secondary cover, it must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
- Our knobs cannot protrude above the Trifid-style rotary cover or they will interfere with the factory dust cover. For better knob access, you can peel off the vinyl escutcheon and remove this cover or simply access the knobs partly from the side.
$25.95
