Installing bobs knobs on a C11

[Earl]

I have a set of Bobs Knobs to install, but I'm concerned that ill butcher it ( i have a habit of doing so).

Any advice would be greatly welcomed

[billhinge]

I just followed the instructions and nothing bad happened, you will need to recollimate so if you don't like doing that it will be an annoyance

Is there something specific you are concerned about?

[kirkster501]

Just do one at a time. This is important or else you'll get it into a mess. So remove one and then recollimate. Do the second, repeat. Then the third.

To get it 95% there stand about 3m back from the front of the OTA and look for concentric circles in the primary after each screw.

[kirkster501]

Also meant to say dont worry about this. Learn to do it. After all its only turning a few screws and tilting mirrors!

[Cath]

I did my C6 last week, was very easy. Just don't over tighten them. I stopped as soon as I felt an increase in force whilst screwing them in.

I've so far only collimated by looking down into the front of the tube (the concentric circles), have yet to do a proper collimation (when the chance arrives).

[Laurie61]

Basically as has already been said. I put my C11 onto the mount and put an EP in, then pointed the scope at a target. I then replaced Knobs one at a time and re-centred the target in the EP, with the newly fitted knob. After completing all three you will be back to your original collimation position.

[Peter Drew]

Make sure that you have the OTA horizontal or pointing slightly downwards, just in case!

[Earl]

Wrong size...... :|

[Cath]

Darn

[kirkster501]

Wrong size...... :|

You sure?

[Earl]

You sure?

Yes these are metric i need the imperial, I bought the second hand so there was a risk..... replacements ordered

[Peter Drew]

I thought Celestron screws were UNF/UNC not metric or imperial. Or have they changed in recent times?.

[kirkster501]

Well you are in good hands with Bob, he will sort you out.

Sent from my iPhone using Tapatalk

[cgarry]

Basically as has already been said. I put my C11 onto the mount and put an EP in, then pointed the scope at a target. I then replaced Knobs one at a time and re-centred the target in the EP, with the newly fitted knob. After completing all three you will be back to your original collimation position.

This is without a doubt the best method and makes the whole operation completely painless.

Cheers,

Chris

[Merlin66]

With gloved hands I found the original Bob's Knob's a bit too fiddly on the C11 (that was with a Fastar secondary) Bob came up with a longer "knob" which allowed more freedom for big fingers - works 100%

[Earl]

I thought Celestron screws were UNF/UNC not metric or imperial. Or have they changed in recent times?.

4 different types on Bobs site.