collimation & cleaning

Bob's Knobs for SkyWatcher MN190 Mak-Newt Primary - SWMNpri

Pre-order. Out of stock.
Bob's Knobs   ——   SKU: BOB-SWMNpri
$55.00 CAD
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Product Info

Bob's Knobs for SkyWatcher MN190 Maksutov-Newtonian Primary

Collimate your SkyWatcher MN190 Mak-Newt Telescope without special tools when you use Bob's Knobs! It's easy: Just grab a Bob's Knob Collimation Thumbscrew and turn it. You can even do it while looking through the eyepiece on many scopes. 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 if you wish. The factory dust cover will fit normally with Bob's Knobs installed on your secondary.

  • Installation is a snap with the included instructions
  • Modification can be undone at any time
  • Knobs are crafted from black plastic, black oxide steel (black) and/or stainless steel (silver)
  • No tools required to perform a collimation!

These Bob's Knobs SWMNpri Collimation screws are for the SkyWatcher MN190 Maksutov-Newtonian telescope's Primary mirror adjustment.

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.

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