Product Details

• Description
• Specifications
• Reviews

• Bob's Knobs for Celestron 8" SCT with Standard Collimation Screws

  
  Now there is no more tools needed to make collimation adjustments to your telescope! It's easy . . . just grab a Bob's Knob and turn. You can even collimate while looking through the eyepiece on most telescopes. What's more, you'll never drop that pesky little Allen wrench or screwdriver in the grass again. Installation is a snap with included instructions, and you can undo the modification at any time.
  
  Fits: Celestron 8 inch (20 cm) f/10 SCT with factory Allen, Phillips, or headless set-style 6-32 collimation screws, with or without Fastar compatible secondary (C8 orange, black, or gray; Ultima 2000; NexStar 8). It is important that you choose the correct style Bob's Knobs for your telescope. Please note the number and type of screws on your secondary housing before ordering.
  
  Some telescope versions have a small plastic cover over the factory collimation screws. This cover must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect operation of the scope.
  
  Fits: These knobs will fit all C8 models made prior to 2005, and all 2005 and later models EXCEPT those with black Phillips factory collimation screws. The black-screw model requires C8 metric knobs. Check that our screw threads match the factory screw threads before installing.

  If you have a C8 manufacturered after 2005 then you will need the metric set, #C8metbo (black oxide) or #C8METSS (stainless steel). If your scope is marked EdgeHD on the corrector ring, then you will need to use #C8EDGEBO or #C8EDGESS.
  
  Bob's Knobs will provide spacers for knobs installed on the Fastar compatible secondary to raise the knobs slightly for easier use. Please note in the "comments" section of our shopping cart if you need these spacers.These knobs will fit all C8 models made prior to 2005, and all 2005 and later models EXCEPT those with black Phillips factory collimation screws. The black-screw model requires C8 metric knobs. Check that our screw threads match the factory screw threads before installing.
  
  Bob's Knobs will provide spacers for knobs installed on the Fastar compatible secondary to raise the knobs slightly for easier use. Please note in the "comments" section of our shopping cart if you need these spacers.
  
  Bob's Knobs Product Number: C8STD

• specifications

  Collimation By Scope	Cassegrains
  Collimation Tool	Collimation Knobs
  Condition	New
  Warranty	Lifetime Warranty