Quote:
Originally Posted by Don Pensack
IF the secondary/focuser axis is perfectly aligned, and IF the primary is perfectly aligned with a Cheshire (reflective circle with dark center), THEN the return beam of a perfectly collimated laser can be used to confirm the alignment of a primary mirror.
But, the barlowed laser technique is more accurate for aligning the primary, and it doesn't even matter if the laser is collimated.
Here is an explanation:
http://www.cameraconcepts.com/barlow...ollimation.pdf |
I just collimated my 130mm f/5 Newtonian and found that I can just see the tip of the Laser Pro at the bottom of the focuser. It was a snap to set to laser dot in the center of the mirror and then confirm the return beam landed less than 1/4" from the small laser beam exit hole. I may tweak the primary later, but for now that'll do it for me.
