Quote:
Originally Posted by Riv39
Thanks Marc, as we speak I think I managed to get it spot on (finally). I don't understand why there appears to be so little adjustment for the secondary. In the end I had to do up the screws quite tight to pull it in the last couple of mm's but all seems good now as the laser is right in the sweet spot of the primary and is returning back on itself perfectly. I hope that I do not have to realign the secondary again.
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Assuming the primary is centered in the tube and the center spot is indeed in its center then having the secondary mechanically centered in the tube by measuring the 4 spider vanes length should get you pretty close to start with. If you find you have to tilt the secondary to its limit to hit the center spot on the primary, I think you might have it offset by too much to start with and you don't have enough room to compensate with the 3 collimation screws.