Bob's Knobs Celestron SCT 9.25” f/10 metric (black oxide)

Bob's Knobs for Celestron SCT 9.25” f/10 Metric:

Simplified Collimation for Your Telescope

• Customized for Celestron SCT 9.25" f/10: Designed for Celestron 9.25” (23.5 cm) f/10 SCT models with metric screw threads, specifically for CPC 925 versions. Not suitable for C9.25 models with “Trifid” Fastar or EdgeHD optics.
• Part Options - Part: C9.25metBO and C9.25metSS:
  • Telescope Compatibility: Ideal for Celestron 9.25" f/10 SCTs with metric collimation screws.
  • Knob Varieties: Available in black oxide steel (black) or stainless steel (silver), each 12 mm (1/2”) in diameter for comfortable grip.
  • Thread Types: Choose between black oxide or stainless steel threads to match your telescope's collimation screws.
• Thread Type Identification:
  • Metric vs. Standard Threads: Black Phillips factory collimation screws typically have metric threads; however, some may have standard threads. Use our hints to identify the correct type.
• Environmental Considerations:
  • Black Oxide Steel: Recommended for dry environments; occasional oiling needed for rust prevention.
  • Stainless Steel: Provides superior corrosion protection, ideal for coastal or humid areas, or where dew is prevalent.
• Knob Accessibility:
  • Knob Position: These knobs sit inside the tall lip around the secondary's perimeter, which may make them harder to grasp. Adjust using a thumb or finger against the knob's inner edge.
• Dust Cover and Secondary Cover:
  • Dust Cover Fit: Ensures the factory dust cover will continue to fit normally with Bob's Knobs installed.
  • Plastic Cap Removal: If a factory-installed plastic cap is present over collimation screws, remove it for knob installation. The cap is cosmetic and won’t affect telescope operation.
• Efficient Telescope Tuning: Perfect for Celestron SCT 9.25” f/10 telescope owners seeking an easy, tool-free method for precise secondary mirror collimation adjustments.