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weird collimation issues

Started by mcdoogla, 01/16/2005 08:55PM
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Posted 01/16/2005 08:55PM Opening Post
Douglas Reilly
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Join Date: Aug 2002

Location: Fort Washington PA, US

Posts: 31

Hi all,
I have a 6" f/8 meade EQ (one of the older sonotube ones, not a starfinder.) Anyway, last night I ran into a bizarre colimation issue. I used a laser to center the secondary, but then checked it with the sight tube...and I could only see part of the primary. Centering the primary didn't help (I use cat's eye). I also noted that I could see part of the SIDE of the secondary holder reflected in the primary from the sight tube (and from the cat's eye). Like a cresent moon around the secondary. What's up!?

doug
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Posted 01/17/2005 12:07AM #1
Hugh Bartlett
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Join Date: Jul 2001

Location: Oakland CA, US

Posts: 233

It sounds like your secondary is rotated. Does it have a center screw?

Hugh Bartlett
Oakland, CA
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"Praise the Lord for the expanding grandeur of creation, worlds known and unknown, galaxies beyond galaxies, filling us with awe and challenging our imaginations." 2007 Reform Siddur
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