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Accessories - Bob's Knobs Collimation Knob For Celestron SCT 5" F/10 - Standard

Bob's Knobs Collimation Knob for Celestron SCT 5" f/10 - Standard

Bob's Knobs
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$19.99 You save 15%
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Estimated Arrival: Between Dec 11 and Dec 17. *ETA to USA Only

Shipping & Returns: Satisfaction guaranteed 30 day return policy.


Bob's Knobs offers knobs for the Celestron 5” Schmidt-Cassegrain secondary with either standard or metric collimation screws in the f/10 and rare f/6 versions. Please use care to select the correct knobs for your telescope. Each knob set is different and they are not interchangeable. Price is for a complete set of knobs.

Fits: Celestron 5” (13 cm) f/10 SCT (C5, NexStar 5) with black Allen, silver Allen, or silver Phillips factory collimation screws. These screws have standard threads. Will NOT fit scopes with black Phillips factory collimation screws.


  1. These knobs will fit all C5 models made prior to 2006, and all 2006 and later models EXCEPT those with black Phillips factory collimation screws. The black Phillips screw model requires C5 metric knobs. Check that our screw threads match the factory screw threads before installing.
  2. The factory dust cover will fit normally with Bob’s Knobs installed.
  3. Some telescope versions have a small plastic cover over the factory collimation screws. This cover must be removed and set aside when Bob's Knobs are installed. The cover is cosmetic only and will not affect the operation of the scope.
  4. The Celestron 5” SCT uses either standard 6-32 or metric M3 collimation screws. Allen and silver Phillips factory collimation screws have standard threads. Most black Phillips screws are metric. If you order knobs with the wrong screws, contact us for return instructions.



Black plastic, 13mm (1/2”) diameter


Black anodized aluminum alloy


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.