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Bob's Knobs for SkyWatcher 5", 6", 8" & 10" Newtonian Primary # SWpri

5.0 (1 Reviews) Read Reviews Write Review
Brand Bob's Knobs
Part Number SWpri
Availability available

Product Info

Manufacturer Description

Collimate your Catadioptric or Newtonian reflector style telescopes without tools!

It's easy...just grab a Bob's Knob collimation thumbscrew and turn. You can even do it while looking through the eyepiece on most scopes. These thumbscrews are also much easier to use with gloves on. And perhaps most importantly, you'll never drop that pesky little Allen wrench or screwdriver into the grass again. Installation is a snap with the included instructions, and you can undo the modification at any time.

Part: SWpri
Fits: SkyWatcher (5", 6", 8", 10") Newtonian telescopes.

Primary collimation
Knobs: Black plastic, 16 mm (5/8") diameter
Threads: Stainless steel

Primary Lock
Knobs: Black plastic, 16 mm (5/8") diameter
Threads: Stainless steel

1. The telescope optical tube assembly will clear the Dobsonian rocker box with primary knobs installed.
2. Knobs with shorter screws and spacers replace the factory flathead Phillips collimation screws. Knobs with longer screws replace the factory set-style (grub) locking screws.
3. Since the factory collimation and locking screws are close together, knobs must be staggered in height. The locking knobs protrude further than the collimation knobs.
4. Protect the locking knobs from damage, and do not support the OTA using the locking knobs as feet.


5.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
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    1. rmscott59

      rmscott59 New Member

      Skill Level
      Time with Product
      User Notes:
      Review by Mark of San Francisco, CA.
      Mar 17, 2012

      5.0 Makes collimating easy!!


      Strong Construction,Accurate,Compact,Easy to Use



      Replaces Phillips head or Allen screws on your telescope's primary mirror to make collimating or subtle adjustments easy to perform...even in the cold or dark, without tools!! Highly recommend!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Manufacturer Bob's Knobs
      Additional Information celestron-car-battery-adapter-18769
      Prism Type No
      Eyepiece Focal Length Ships by Next Business Day