How do I perform coarse collimation after installing Bobs Knobs?
When Bob’s Knobs are first installed, the telescope will usually be out of collimation. It’s often easier to do a coarse collimation in daylight first, and then finish with a star at night. Before you install Bobs Knobs, swing your optical tube assembly (OTA) on its mount so you can look directly into the front from 5 to 10 mirror diameters away. Youll notice that the various primary and secondary mirror reflections form a set of concentric circles in a properly collimated scope. This is what you want to see again after installing the knobs. (Hint: cut a small hole in the center of a piece of white paper or cardboard and look through it to eliminate extraneous mirror reflections.) After installing Bob’s Knobs, tighten and loosen appropriate knobs until the mirrors and their reflections are once again concentric, and the secondary mirror is held securely. If a knob becomes harder to turn when tightening, loosen the opposite knobs slightly instead. Check your owners manual for additional
