Bob's Knobs are the most famous collimation screws in the world and, for many years, they make collimation simpler and faster. By installing these screws instead of the original ones of the telescope, you can easily collimate by hand!

Celestron Schmidt-Cassegrain or Aplanatic Schmidt-Cassegrain (EdgeHD) telescopes have several advantages, also the ease of collimation since you need to set only the front secondary mirror. However, collimation screws always require the use of a screwdriver or an Allen screw and making small corrections during the night may not be easy.

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Bob's Knobs