About this product
Model: bk_c11_met_fst
Part Number: C11metfst
Bob's Knobs are the BEST option for tool-free collimation.
Simple to fit and easy to use.
Collimate your telescope without an Allen key or screwdriver!
Instructions are supplied but can also be found online as well as useful FAQ.
Images are representative and may not show the exact knob size / threads.
IMPORTANT: Please ensure the Bob's knobs threads and factory screw threads match before installation.
Knobs for C11 f/10 with “Trifid” Fastar Secondary Housing and Metric Collimation Screw Threads
Part: C11metfst
Fits: Celestron 11” (28 cm) f/10 SCT versions (metal or carbon fiber tube) with metric thread factory collimation screws and
"Trifid" rotary cover Fastar secondary housing. Factory collimation screws are black Phillips. These knobs will fit the
C11 with EdgeHD optics. They will also fit the
C11 with Starizona Hyperstar if the collimation screws have metric threads.
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel
Notes: - These telescopes can have factory collimation screws with either standard or metric threads. Most models with black Phillips collimation screws have metric threads. There are a few black Phillips screws with standard threads. See our hints for more information. If you discover your knobs have the wrong threads, you may return your knobs for exchange at no additional cost. Alternatively, you can order knobs with both standard and metric thread screws and return the unused set for a full refund.
- Collimation screws on these telescopes are small with very fine threads. Knobs must be tightened gently (just enough to hold the secondary in place) to prevent damage to either the knob or secondary assembly.
- The factory dust cover will fit normally with Bob’s Knobs installed.
- The rotary secondary cover must remain open when the knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
Customer reviews
| Average Rating (2 Reviews): | |
07 December 2021 | Michael
I purchased these for my Celestron C11 Faststar. I replaced the original Philips head screws which were very difficult to adjust using a screwdriver, and had the potential risk of the screwdriver slipping out of the very small screw heads and scratching the corrector plate. They were easy to install, just follow the advice on the packet. Collimation is now very easy and far less time consuming. Definitely an upgrade worth doing.
Makes collimation less stressful! 29 April 2018 | Alan
I have these on both my SCTs. After nervously collimating with a screwdriver on the original adjustment screws, I had to get them changed for these no-tools-needed knobs instead. Wow, they are so much easier to use and without the worry of scratching the corrector plate. Remember to let your scope cool fully before attempting collimation and make sure you finish up with all three knobs nice and tight 
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