CELESTRON 14” (36 cm) SCT

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.

Special Note: The Celestron 14” SCT uses either standard 6-32 or metric M3 collimation screws. Headless set-style factory collimation screws have standard threads. Phillips screws can have either standard or metric threads. Phillips collimation screws are found on both EdgeHD and non-EdgeHD late model C14 telescopes, either with or without the Fastar secondary. Generally black Phillips collimation screws have metric threads and silver Phillips collimation screws have standard threads. Some black Phillips collimation screws have standard threads, however, so if you order the wrong screws you can exchange them at no additional cost.

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:
  1. 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.
  2. The factory dust cover will fit normally with Bob’s Knobs installed.
  3. Do not adjust the center secondary screw if present.

$19.95

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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:
  1. These telescopes can have factory collimation screws with either standard or metric threads. Silver Phillips collimation screws are standard thread. Black Phillips collimation screws usually have metric threads, but some have standard threads. Telescopes manufactured prior to about 2008 have collimation screws with standard threads, and later scopes have collimation screws with metric threads. If you discover your knobs have the wrong threads, you may return your knobs for exchange at no additional cost. Alternatively, you can order knobs with both standard and metric thread screws and return the unused set for a full refund.
  2. The factory dust cover will fit normally with Bob's Knobs installed.
  3. The rotary secondary cover must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
  4. Our knobs cannot protrude above the Trifid-style decorative attachment or they will interfere with the factory dust cover. For better knob access, you can peel off the vinyl escutcheon and remove this attachment, or simply access the knobs partly from the side.

$19.95

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C. Knobs for C14 f/11 Secondary with Factory Phillips Collimation Screws with Metric Threads
C9.25fstlg

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: Stainless steel

Notes:
  1. These telescopes can have factory collimation screws with either standard or metric threads. Silver Phillips collimation screws are standard thread. Black Phillips collimation screws usually have metric threads, but some have standard threads. Telescopes manufactured prior to about 2008 have collimation screws with standard threads, and later scopes have collimation screws with metric threads. If you discover your knobs have the wrong threads, you may return your knobs for exchange at no additional cost. Alternatively, you can order knobs with both standard and metric thread screws and return the unused set for a full refund.
  2. 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.
  3. The factory dust cover will fit normally with Bob's Knobs installed.
  4. The rotary secondary cover must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
  5. Our knobs cannot protrude above the Trifid-style decorative attachment or they will interfere with the factory dust cover. For better knob access, you can peel off the vinyl escutcheon and remove this attachment, or simply access the knobs partly from the side.

$22.95