Bob's Knobs Sky-Watcher 190MN Collimation Knobs
 Choose: Primary Adjustment & Lock KnobsChoose: Secondary Adjustment Knobs (30mm) 

Bob's Knobs Sky-Watcher 190MN Collimation Knobs

  (2 Reviews)
✓ 2 year warranty


1x in stock shipped 1-2 working days

About this product

Model:  bk_mn190_pri
Part Number:  MN190pri

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.

Images are representative and may not show the exact knob size / threads.

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

Knobs for SkyWatcher MN190 Mak-Newt Primary

Part: SWMNpri
Fits: SkyWatcher MN190 Maksutov-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
  1. Knobs with shorter screws and spacers replace the factory Phillips collimation screws. Knobs with longer screws replace the factory set-style (grub) locking screws.
  2. 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.
  3. Protect the locking knobs from damage, and do not support the OTA using the locking knobs as feet.

Knobs for SkyWatcher MN190 Mak-Newt Secondary

Part: SWMNsec
Fits: SkyWatcher MN190 Maksutov-Newtonian telescopes.

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

  1. Our secondary knobs are mounted on long screws to clear the deep secondary lip.
  2. The small cover over the secondary collimation screws must be removed and set aside when Bob’s Knobs are installed. This cover is cosmetic only and does not affect operation of the scope.

Customer reviews

Average Rating (2 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Useful accessory
30 November 2022  | 

I recently had to take the plunge and recollimate an MN190 from scratch. I took the opportunity to fit Bobs Knobs to the primary, and am really glad I did as the final star test adjustments were much easier than previously with the OEM screws. Fitting was easy, and following the instructions and fitting one at a time there was no movement in primary alignment. Highly recommended.

Rating (max 5):  
Makes collimation so much easier
15 June 2019  | 

I bought these for my SW 190MN and a set for a 150PDS. It doesn't make collimation any more intuitive to me, but it does make it so much easier. With the hex grub screws, I was forever having to move to the front of the scope and fiddle around; sometimes the hex key got a bit stuck so I'd have to wiggle it out, etc. This is so much better. I really don't understand why manufacturers don't fit something like this as standard on the secondary.


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