Bob's Knobs Celestron / Sky-Watcher Newtonian Collimation Knobs
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 Choose: Primary Adjustment & Lock KnobsChoose: Secondary Adjustment Knobs (30mm) 

Bob's Knobs Celestron / Sky-Watcher Newtonian Collimation Knobs

£28.00
  (4 Reviews)
✓ 2 year warranty
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In stock shipped 1-2 working days.

About this product

Model:  bk_cswn_pri
Part Number:  SWpri

Bob's Knobs are the BEST option for tool-free collimation.

Simple to fit and easy to use.

Collimate your telescope without an Allen key or screwdriver! 

Instructions are supplied but can also be found online as well as useful FAQ.

IMPORTANT: Please ensure the Bob's knobs threads and factory screw threads match before installation. 


Knobs for Celestron C6-N/NGT, C8-N/NGT, and C10-N/NGT Primary

Part: SWpri
Fits: Celestron C6-N/NGT, C8-N/NGT, and C10-N/NGT Newtonian telescopes.
 

Primary collimation:

  • Knobs: Black plastic, 16 mm (5/8”) diameter

  • Threads: Stainless steel

Primary Lock:

  • Knobs: Red plastic, 16 mm (5/8”) diameter
  • Threads: Stainless steel
Notes:
  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, and they are now red in color.
  4. Some telescopes have a cover over the primary collimation screws. This cover must be removed and set aside when Bob’s Knobs are installed.
  5. Protect the locking knobs from damage, and do not support the OTA using the locking knobs as feet.

Knobs for Celestron C6-N/NGT, C8-N/NGT, and C10-N/NGT Secondary

Part: CNsec30 or CNsec35
Fits: Celestron C6-N/NGT, C8-N/NGT, and C10-N/NGT Newtonian telescopes.

Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel

Notes:

  1. Bob offers knobs with screws having either 30 mm or 35 mm length. Order knobs with a screw length sufficient to allow the knobs to clear the secondary housing. Knobs with 30 mm screws are the most common in this configuration and are the only ones we stock currently as this is what most people need.

Knobs for Sky-Watcher Newtonian Primary with Factory Collimation Screws

Part: SWpri
Fits: SkyWatcher Newtonian telescopes with factory collimation screws. If your scope already has factory fitted collimation and lock knobs then these are a different design and cannot be replaced with this part. 

Primary collimation

  • Knobs: Black plastic, 16 mm (5/8”) diameter
  • Threads: Stainless steel

Primary Lock

  • Knobs: Red plastic, 16 mm (5/8”) diameter

  • Threads: Stainless steel

Notes:
  1. Our knobs will fit only a primary with factory collimation screws. If your telescope already has factory collimation knobs our knobs will not fit.
  2. The telescope optical tube assembly will clear the Dobsonian rocker box with primary knobs installed.
  3. 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.
  4. 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, and they are red in color.
  5. Protect the locking knobs from damage, and do not support the OTA using the locking knobs as feet.

Knobs for Sky-Watcher Newtonian Secondary

Part: CNsec30 or CNsec35
Fits: SkyWatcher (5”, 6”, 8”, 10”, 12”, 14”, 16”) Newtonian telescopes.

Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel

Notes:

  1. Bob offers knobs with screws having either 30 mm or 35 mm length. Order knobs with a screw length sufficient to allow the knobs to clear the secondary housing. Knobs with 30 mm screws are the most common in this configuration and are what we currently stock. However, the 12”, 14”, and 16” sometimes require knobs with 35 mm screw length.

 

Customer reviews

Average Rating (4 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Secondary Adjustment Knobs
Thursday, 8 November 2018  | 

Got these yesterday after years of struggling to get good collimation on my 200P, they are easy to fit and use. In fact it would be good if they were installed on all new scopes, as setting up and keeping collimation would be less time consuming.


Rating (max 5):  
They do what it says on the tin!
Friday, 21 September 2018  | 

Have had several sets of Bob's Knobs over the years. They are always well-made and robust. Hard to believe in this day and age that all dobs and reflectors don't come fitted with collimation knobs as standard. Most serious stargazers consider collimation screws to be a necessity so if your scope doesn't have any get yourself a set of Bob's pdq!!


Rating (max 5):  
collimation made easier
Monday, 25 June 2018  | 

these knobs are a must-have for newtons, replaced the stock screws with bob's knobs and , extra tools are no longer needed for collimation (except when using a collimator). easy recplacement, remove one screw at a time, adjust collimation and you're ready. no hex-tools needed anymore. recommended.


Rating (max 5):  
worth changing for
Friday, 27 April 2018  | 

I changed the collimation screws on my SW 200p to Bobs Knobs ,makes collimating so much easier especially for the secondary no risk of drooping an allen key onto mirror ,i did change the primary screws too, the primary wasn't so much of an issue and could have left the originals on tbh ,rated 4 stars due to cost for what they are .

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