[Scooter]

Hi Folks,

OK so got the new GSO 12" DOB and been messing around as per my first light thread but I have an issue with star tests.

Now from what I have read doing a star test should give me an indicative idea of the quality of the optics and how good the collimation is (everything I read says the is the definitive test). So do my research on star tests and do some last night and what I get is nothing like what I should get.

Basically I picked a few bright stars (I now read should be mag 1 or 2 stars so will try again tonight on recommended targets) and did them at around 200x (now read should be on 600x so again will try again) and all I get is the back hole with a wide light band around. The large light band around gets more solid or fuzzy with the ammount of off focus and I can vaguely see the spider which gives it a crosshair like appearance.

Now everything I see on the net shows concentric rings so I am worried as mine looks nothing like that. Mine is as per attached pic and its just the single band that increases or decreases in size and fuzzyness with off focus.

Whats the go?