Center Spotting the Primary Mirror

Center spotting the primary mirror is one of the activities you should be doing to properly align the scope. Even the best optics perform poorly if not aligned properly. Center spotting is not complex and can be simply done at home. As I am working on my 5″ scopes project, I thought to document it

5″ F/7 Project

Recently I decided to start two 5-inch F/7 projects. In India, it is easy to get smaller readymade spherical mirrors. The mirrors I got are 127 mm in diameter and 900 mm in focal length; which effectively puts their F number to F/7. I have been told that at this size and focal length, you