Quote:
Originally Posted by JB80
I got a Seben collimator for Christmas and it's fine, I tend to use it as a compliment to my Chesire.
That said once I spin the laser 180° in the focuser it moves off centre which leads me to believe the focuser is off whack and I can't work out how to fix that so might just upgrade my focuser.
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The OP mentioned there are 3 alignment grub screws that you can tweak to re-align the collimator.
Make a V shaped jig and strap the laser in there, perhaps with a rubber band or hairband. Fix the jig down so it doesn't move. Have the dot hit a piece of paper a few meters away and rotate the laser.
As you rotate it you should notice the dot move around in a circular pattern. Record the circle, find the centre of the circle and mark it out on the paper.
Then as you make your adjustments, aim to have the dot stationary on the centre mark as it's rotated.