Quote:
Originally Posted by Robh
Collimate your primary then fix it using the locking screws. Check your collimation again as the locking screws themselves may vary it. Now move your scope up and down. Does the collimation still change after you lock up the mirror?
I had a similar problem with my 12" Lightbridge. The primary mirror springs were so puny the collimation screws just didn't work properly. In fact, I used the locking screws as the primary collimators. The problem was solved by replacing the springs with heavier ones.
Refer to these recent threads ...
http://www.iceinspace.com.au/forum/s...ad.php?t=59148
http://www.iceinspace.com.au/forum/s...ad.php?t=58731
Regards, Rob |
Thanks Rob for those links. Unfortunately the Portaball doesn't use the spring setup like the lightbridge. Had another look and realise the same thing was happening with trying to collimate the secondary mirror as well, i.e. when moving in the altitude motion, the laser dot will be aligned in the primary mirrors centre circle when at 45deg altitude, tilt it to the Zenith and the dot moves one way, to the horizon and it moves to the other.
The laser seems quite secure in the focuser and will only move if I force it to by hand. Perhaps it still could be the laser jiggling around ever so slightly?