Bob's Knobs

Makes collimating a Celestron Schmidt-Cassegrain telescope very easy, just grab one of the Bob’s Knobs screws and turn it. You can even do it while looking through the eyepiece with most telescopes. Installing the knobs is done in a jiffy with the clear manual. And you can always uninstall it again.

Another added advantage is that your Phillips screwdriver will no longer fall into the grass.

Pitch of the thread

When ordering the Bob’s Knobs, pay attention to which original screws are now in it. It is important that you order the right knobs with the right pitch. Metric or the American standard, if you cannot find it, please feel free to contact us so we can help you.