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tjmck
super member
Reged: 10/06/07
Posts: 157
Loc: Winnipeg, Manitoba, Canada
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Re: home made collimating sight tube
07/03/08 10:28 PM
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John,
I have also used the method WOJO describes.
Thought I would add to the thread that for a 2" focuser, built in vacuum systems use PVC pipe that has a 2" outside diameter. You may have to check a few pieces to find one that works as the dimensional quality control is not all that good. The good news is that most vacuum installation places / contractors have off cuts that they will normally give you once you educate them what you will use it for.
tjmck
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