Brands - JMI



Secondary Knobs for Orion and Sky-Watcher Dobsonians 35 mm


SKU: CNsec35
Manufacturer: Bob's Knobs


These knobs with 35 mm screws replace the set factory secondary mirror collimation screws on Orion and Sky-Watcher Dobsonian telescopes. 

Knobs for Orion and Sky-Watcher Newtonian Secondary (30 mm)


Fits: SkyWatcher (5”, 6”, 8”, 10”, 12”, 16”) Newtonian telescopes. Orion SkyQuest XX-series with factory set-style secondary collimation screws. Suggested for 12" and larger models, but see notes below.

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

Threads: Stainless steel


  1. 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 are the most common in this configuration. However, the 12” and 16” sometimes require knobs with 35 mm screw length.

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