Home > Accessories > Collimation > Bob's Knobs
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Model: bk_c8_met_boPart Number: C8metBO
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.
Part: C8metBO (black oxide steel); C8metSS (stainless steel)Fits: Most Celestron 8” (20 cm) f/10 SCT made in 2005 and later with black Phillips factory collimation screws that have metric threads. Includes SkyWatcher SCT and non-EdgeHD Fastar.Knobs: Black oxide steel (black) or stainless steel (silver), 12 mm (1/2”) diameterThreads: Black oxide or stainless steelNotes:
Ok , I'm a fan of these . Let's get that out of the way first . Bobs knobs are probably one of the best extras you will buy for your Newtonian or your SCT as they make collimating so easy , especially in an sct . No more fiddling with a screwdriver to centre on those, quite frankly, pathetically small collimation screws. Normally I would say that the cost is a bit high for three screws but this product is a really practical accessory for your scope . There are many "extras" that you can buy in this hobby , Bobs Knobs are a necessity. In my opinion .
Great value, quality made. I would recommend
Fast delivery, knobs easy to fit and work well!
These are a god send and I can collimate my Nexstar in a minute or two. No more screwdrivers dangerously close to the corrector plate. Not much comes as cheap in astronomy and has such a positive impact. Delivered in 2 days
Do exactly what they say on the tin, easy to tweak collimation, excellent.
The 8" SCT is not a big scope but it's difficult to reach the adjusting screws whilst holding a screwdriver and looking through the eye piece at the same time. Bobs knobs enable me to look through the eye piece and make the adjustments necessary with ease with no risk of damaging anything. It's a cheap mod and well worth the price.
Got an Celestron 8SE and usually spend a substantial amount of time for collimation (I am a newbie on AP ) with my screwdriver in order to not to scratch anything while moving the screws.. It is much much more quicker and less riskier with these knobs. Great product, definitely recommended to all SCT owners.