I put a new 16″ primary mirror in my telescope a few months back, and last night I got around to installing the center dot and mounting the glass in the tube.

The center reflective marker is critical for performing collimation, which is the process of getting the primary and secondary mirrors aligned such that the wavefronts are both centered, and collinear. I use a laser collimator which allows excellent alignment of both the primary and secondary mirrors.

It looks to be cold and clear tonight, so hopefully I can get it out and see the seeing. Audrey is particularly interested in looking at Jupiter.