Bob's Knobs StellaLyra / Celestron / Sky-Watcher Newtonian Collimation Knobs
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Choose: Primary Adjustment & Lock KnobsChoose: Secondary Adjustment Knobs (30mm)Choose: Secondary Adjustment Knobs (35mm)

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

£29.00
  (15 Reviews)
✓ 2 year warranty
  

  

2x 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 StellaLyra Dobsonian Secondary

Part: CNsec35
Fits: StellaLyra (6”, 8”, 10”, 12”,  16”) Dobsonian telescopes.

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

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.

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. However, the 12”, 14”, and 16” sometimes require knobs with 35 mm screw length.

 

Customer reviews

Average Rating (15 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Good but why so pricey?
26 January 2023  | 

Works really well and collimating my Skywatcher 200p is now much easier, I can't bring myself to vote anymore than 3 stars because of the price, should cost a tenner max. I reckon you could source similar off the shelf at any decent DIY shop.


Rating (max 5):  
MUST HAVE!
12 January 2023  | 

Replacing my secondary collimation Allen key screws with Bob's Knobs is one of the best things I've done with my 200 Newtonian. No more fiddling and worrying about dropping a small key. These should be standard fitting on all reflector telescopes. But them!


Rating (max 5):  
I've been using Bob's Knobs on my Newtonian scopes for years and I wouldn't be without them!
26 November 2022  | 

Bob's Knobs made collimation of my Newtonian scopes so much easier -- and safer! Collimating with small tools, at night, in the cold, makes it too likely I'd drop the tools down the tube and possibly hit the primary mirror. I love these knobs and wouldn't be without them.


Rating (max 5):  
Compatible with StellaLyra 12 dob
10 November 2022  | 

I do not need a screwdriver anymore. These knobs fit perfectly and make collimation possible without any tools.


Rating (max 5):  
Bob's Knobs - Collimation Upgrade
09 September 2022  | 

I recently purchased an 8 inch Dobsonian and being my first I decided to do some research to get familiar with this type of telescope. One of the suggested upgrades was to change the collimation screws for the secondary mirror to these and after contacting FLO who by the way replied back quicker than an asteroid flying through space recommended which type to get (there are two lengths).
Instructions were very clear and I was able to collimate the secondary mirror without using a screwdriver once installed just remember to remove one screw at a time.
Are they expensive... For three screws yes but consider this...
If you have to adjust your mirror with a hex key or screwdriver and it slips out of your hand, you'll freeze and time seems to stand still while you watch where it lands.
Fortunately for you in lands on the floor and not on that super reflective mirror inside the end of that tube.
Also prior I used to tilt the tube just below horizontal before adjusting just in case the above happened but having to crouch so low and look down a tube can be a bit uncomfortable plus that's one less tool I need to carry around.
All-in-All I'm pleased with this little additional upgrade, still as with anything you have to be careful when making adjustments but a lot less worrying

Thanks FLO top notch service.


Rating (max 5):  
Bovb's Knobs are the Bee's Knees!
23 May 2022  | 

Despite the rather high price these (I have them on my Newtonian's secondary mirror) have made the chore of collimation so much easier.


Rating (max 5):  
Bobís Knobs
28 April 2022  | 

These replacement adjusters are a worthy upgrade to my Skywatcher Quattro 200. I was always nervous of dropping an Allen key while collimating and damaging the primary, these knobs completely remove that danger. Good value and best of all they just work, not much more to ask. Highly recommended.


Rating (max 5):  
bobs knobs
03 December 2021  | 

this product makes setting the collimation of a newtonian mirrors very simple
FLO there service i rate it at over 100 %


Rating (max 5):  
An essential upgrade
02 September 2020  | 

Although not listed these are perfect for my Orion Optics (UK) 8" Europa Newtonian which although of some age is giving excellent service.
Very easy to fit - just follow the comprehensive instructions and now collimation is very quick and easy. As others have said, these should now be standard equipment on all suitable scopes.


Rating (max 5):  
What you need
22 August 2019  | 

I have headache times trying to collimate my Newtonian and using that HEX L-key for the secondary mirror, now it is no more with this knobs, fits perfectly and collimating isn't easier than that.

Again, thanks FLO.


Read all 15 customer reviews...

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