I have a brand new Obsession 15UC and have been reading Vic Menard's book on how to understand collimation, as well as some posts on collimation and after several weeks with the scope, I am fairly convinced I have the collimation very close to where it should be. The spider is centered on the Ostahowski mirror center mark viewed through the diagonal mounting hole, the diagonal is centered in my sight tube, the 1mm laser from my new Howie Glatter collimator is centered on the primary center mark and the center mark reflection is centered on the Barlow attachment reticule and agrees with my collimation cap.
I have another post regarding the secondary mirror on my telescope showing an odd "center marker". Now that I believe I have the collimation right, I can see the "center marker" is not only strange in appearance, it is not close to being centered and needs to be removed.
I believe I can remove the center marker with Acetone, but I'm very surprised that a brand new telescope from this manufacturer needs this done to it. Having owned only TeleVue telescopes for more than 30 years I'm not sure what I should have expected.
I realize demand for telescopes is very high, but I want to ask people who have owned Obsession telescopes for as long as I've owned TeleVue scopes - Has the brand changed? is my experience unusual?