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Accessories - Bob's Knobs Collimation Knobs For Astrosystems 2.0 & 2.14 Secondary

Bob's Knobs Collimation Knobs for Astrosystems 2.0 & 2.14 Secondary

Bob's Knobs
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Estimated Arrival: Between Sep 22 and Sep 28. *ETA to USA Only

Shipping & Returns: Satisfaction guaranteed 30 day return policy.


The knobs below will fit the AstroSystems 2.0 and 2.14 secondary, both of which use the same knobs. AstroSystems secondary assemblies are used in several different Newtonian designs such as the Starmaster series, and are characterized by four collimation screws instead of the usual three. Price is for a complete set of knobs.

Fits: AstroSystems 2.0 and 2.14 secondary


  1. Four knobs are included with this kit.
  2. These knobs will fit the AstroSystems 2.0 (used on the Starmaster 12.5) and AstroSystems 2.14 (used on the Starmaster 14.5) secondary assemblies. Both of these secondaries come from the factory with headless set screws for adjusting collimation.
  3. On some AstroSystems secondaries the knobs will slightly overhang the edge and enter the light path.



Black plastic, 16mm (5/8”) diameter


Stainless steel


We know that once you've placed your order, you are anxious to receive it! We make every effort to get your order shipped out to you as quickly as possible.

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. We will process the charges to your credit card and your order will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at

Standard shipping time in the US is between 3-5 business days, though it can vary slightly depending on the destination. We typically For updates on your shipment you can enter your tracking number here.

We distribute nationwide via UPS and Fedex. Unfortunately, at this time we are not able to provide expedited or international shipping.