We offer knobs for the SkyWatcher Newtonian on Dobsonian mount primary with factory collimation screws only, and for the SkyWatcher Newtonian on Dobsonian mount secondary (all types). If your SkyWatcher primary is already equipped with factory knobs, our primary knobs will not fit. Select the type of knobs for your telescope from the list below. Price is for a complete set of knobs.
A. Knobs for SkyWatcher Newtonian Primary on Dobsonian Mount with Factory Collimation Screws
Part: SWpri
Fits: SkyWatcher Newtonian telescopes with factory collimation screws.
Primary collimation
- Knobs: Black plastic, 16 mm (5/8”) diameter
- Threads: Stainless steel
- Knobs: Red plastic, 16 mm (5/8”) diameter
- Threads: Stainless steel
- Our knobs will fit only a primary with factory collimation screws. If your telescope already has factory collimation knobs (see Item B below) our knobs will not fit.
- The telescope optical tube assembly will clear the Dobsonian rocker box with primary knobs installed.
- Black knobs with spacers replace the factory flathead Phillips collimation screws. Red knobs replace the factory set-style (grub) locking screws.
- 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.
- Protect the locking knobs from damage, and do not support the OTA using the locking knobs as feet.
$27.95
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B. Knobs for SkyWatcher Newtonian Primary with Factory Collimation Knobs
Some SkyWatcher models are equipped with factory collimation and lock knobs. Our knobs will not fit these telescopes. Although the lock knob is small, its proximity to the collimation knob prevents replacing it with a larger knob. Furthermore, the primary adjustment knob is of a different design than our replacement knobs.
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C. Springs for SkyWatcher Newtonian on Dobsonian Mount Primary
Part: CNspr
Fits: SkyWatcher (5”, 6”, 8”, 10”, 12”) Newtonian telescopes.
Primary mirror springs as supplied by the factory can sag from the weight of the mirror cell. Our stainless steel replacement springs are stronger and provide adequate support to maintain primary mirror collimation. We recommend that the mirror locking screws remain in place for additional control.
$19.95
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D. Knobs for SkyWatcher Newtonian on Dobsonian Mount Secondary
Part: CNsec30 or CNsec35
Fits: SkyWatcher (5”, 6”, 8”, 10”, 12”) Newtonian telescopes.
Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel
Notes:
- We offer 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 typically work best with apertures 10" and smaller. Knobs with 35mm screws typically work best with apertures 12" and larger.
$22.95
