Bob's Knobs - Celestron 9.25 inch (23.5 cm) Fastar - Collimation Tool

Bob's Knobs voor Celestron 9.25 inch (23,5 cm) F/10 SCT met "Trifid" Fastar.

Celestron 9.25" (23.5 cm) f/10 SCT versions with "Trifid" Fastar secondary housing

Knobs: Black plastic, 15 mm (5/8") diameter
Threads: Stainless steel

Notes:

• These knobs fit the Celestron 9.25" f/10 SCT with a Fastar secondary which has black Phillips factory collimation screws that are recessed into the secondary housing. These versions may or may not have EdgeHD optics.
• 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.
• Knobs include a set of long spacers so they sit slightly above the rotary cover opening.
• The factory dust cover will fit normally with Bob's Knobs installed.
• The rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.

Specification:

Bob's Knobs voor Celestron 9.25 inch (23,5 cm) F/10 SCT met "Trifid" Fastar:

• Set van drie Bob's Knobs collimatieschroeven;
• Knoppen: zwart staal, 15 mm (5/8") diameter;
• Schroefdraad: zwart staal.
  

Extra info:

The factory dust cover will fit normally with Bob's Knobs installed.

The CPC 925 SCT requires knobs with metric threads. The CPC 925 secondary can be identified by 1) a factory-installed plastic cover over the collimation screws; 2) black Phillips factory collimation screws; and 3) brand information on the inside of the housing. The secondary housing cover will still fit when Bob's Knobs are installed, but can be left off if desired. The cover is cosmetic only and will not affect operation of the scope.

Celestron 9.25 inch SCTs manufactured prior to 2006 have standard 6-32 collimation screws and require knobs with standard threads. These telescopes can be identified by 1) no writing inside the secondary housing (except for the serial number); and 2) most have silver factory collimation screws. Do not use metric knobs on these telescopes.

A few non-CPC 9.25 inch scopes manufactured in 2006 have black Phillips factory collimation screws that aren't metric. These require knobs with standard threads.