Quote:
Originally Posted by RobF
Sorry - what do you gain by removing the 2nd o-ring Eric?
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If you have a barrel suspended by two o-rings on either end and three collimation screws about two thirds along the barrel between them then adjusting the screws can give interesting results. If you tighten one you'll shift the end of the barrel closer to the screw - until the ring on that end won't compress any further, then you start shifting the other end, counter-acting your adjustment.
Ideally, a barrel should be fixed (in position, not angle) at one end and held by collimation screws at the other. That's what this mini-mod is about.
Cheers
Steffen.