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tjmck
super member
Reged: 10/06/07
Posts: 117
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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10" F4.7 Dob - home built
Meade ETX-125PE, 1247 Focuser, DSI Colour
Pentax 20x60 PCF WPII w/ home made parallelogram mount
Numerous eyepieces (don't we all have them?)
Home made accessories: power center, dew controller, observing chair, Hartmann mask, dew shields, counter weights, cases and storage solutions.
Inspiration for most modifications and home made items from CN posts!
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