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Accessories - Bob's Knobs Collimation Knobs For Vixen R200SS Primary

Bob's Knobs Collimation Knobs for Vixen R200SS Primary

Bob's Knobs
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Estimated Arrival: Between May 20 and May 26. *ETA to USA Only

Shipping & Returns: Satisfaction guaranteed 30 day return policy.


We offer knobs for the Vixen R200SS Newtonian primary and secondary. Select the type of knobs for your telescope from the list below. Price is for a complete set of knobs.

Fits: Vixen R200SS telescopes.


  1. 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. Locking knobs are now red for easy identification.
  2. Early versions of the R200SS primary use metric M5 screws for primary adjust instead of the M4 screws that we provide. You can pull a primary adjust screw, which is the Phillips screw, and measure the thread diameter. If you need M5 primary adjust screws with your knobs, please enter a note in the window provided during checkout.
  3. Protect the locking knobs from damage, and do not support the OTA using the locking knobs as feet.


    Primary Collimation


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


    Stainless steel


    Primary Lock


    Red 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.