Quote:
Originally Posted by Cluster
Hi,
Today I received a GSO laser collimator for my GSO 6" reflector. I've turned it on and did a simple roll test (roll across the end of a desk) and it seems to be in a straight line. I'll do a V wedge test later. Turning the collimator in the focus tube shows a tiny deviation from dead center (about 1 or 2 mm on the primary mirror).
The main question is, the laser doesn't come to a point when shone on the wall. At about 2 metres away it's a slit about 4mm wide. On my telescope's primary mirror it's very difficult to tell if it's in the center of the mirror as the laser is so broad. I think I have achieved collimation of the primary and secondary as the return laser beam is bang on target in the collimator.
When I pointed the laser collimator through my GSO 3x ED barlow, collimation was a bit off but not too bad (in my opinion). Is the laser point (it was pretty large, about 2cm across) meant to be dead bang in the center of the primary mirror?
Unfortunately it's very windy outside so I can't do a star test tonight.
Do the three Allen key holes in the GSO collimator just move the beam, or do they adjust the focus of the beam itself?
GSO did not provide any instructions with the collimator. I think that's a bit slack.
Thanks,
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I know what you mean. Many cheaper lazer modules I have used over the years in different projects have not been round beams, but elongated. You have to spend big dollars for a good module. A friend of mine has a top quality = $$$$ module mounted on a very high power rifle, and at 100m you could take the head off a mouse with it (not kidding).
Usually to adjust the focus of the beam you need to remove the brass lens housing, and adjust the beam focus. Don't know how much of a hack job this would be on the GSO Lazer Coll. I have no idea how bad yours is, but from what you say it isn't as good as some I've had, which would be 4mm at over 50m.
The deviation in the focus tube might just be run out in the focus tube? You might have to shim the focus tube / collimator / and then eye pieces up, to avoid going out of whack every time you drop a new piece in the hole?
You know what's bad, I've ordered one as well, for my 12" GSO Dobs, which was destroyed in transit by a fool who crushed it with a forklift!
Ah what the hell, it's only money I would otherwise spend on more crap I don't need....