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Old 22-12-2011, 10:09 AM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Sydney
Posts: 22,060
Primary alignment and collimation with Hotech Laser

This is a quick series of pics I took of the setup I used to align the optics on my C11 the other night.

I purposely place the cross laser far enough for added precision. The light path with the secondary in place folds four times.

Because I can now tilt the primary all I have to do is match the inner cross with the outer cross. This ensures my primary is square with my back focus which is really what I care about.

Then standard collimation follows which is just tilting the secondary and finally star test, hopefully tomorrow night.

I have taken the scope apart twice since I originally tilted the primary and locked it and I'm happy to say it hasn't moved a bit since.

Yesterday I removed the corrector and flipped it around then recollimated the secondary and everything was still inline so it looks like it's rock solid now.

With the old primary mounting, moving the scope from A to B would shift collimation.
Attached Thumbnails
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Click for full-size image (hotech_06.jpg)
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