Hi all-Just a quicky-- if anyone can help?
I have a new 12" GSO dob that showing a collimation drift(on altitude)
and is quite noticable using the Catseye teletube and Autocollimator.
After collimation(lets say at 60deg) you can watch the catseye triangle via the teletube, move untill zenith is reached and returning to 60deg, collimation moves back to perfect again.
Its not much--but its there all the same.
-I have fitted heavy primary springs.
-The mirror locking screws do not help.
-Mirror clips are just right?
-Spider vane is tight(with washers fitted underneath)
-Fitted sec bobs knobs(with milk jug washer mod)and are firm
-Focuser is tight
Am I missing something--or should I expect a little flexure in the 12"?
I have a 10" that is set up the same way --and its
brilliant at holding collimation!
Any thoughts would be really appreciated people!
Cheers-Eric