[Stu Ward]

So I have this GSO Laser Collimator and Bobs knobs on the secondary of my 8" Dob

Collimation appears to be good, although i can never quite get the laser beam into the middle of the donut on the primary.

Stars appear to be sharp moon and planetary seems good.

But what bugs me is that if i look at a star totally out of focus the shadow of the secondary cast on the blurry star is nowhere near the middle ( as basic collimation methods say it should be )

So is my dob collimated properly or not ?

Stu