FreeLists / az-observing / [AZ-Observing] Re: newbie collimation questions.

["Wes Edens" <EDENSW@xxxxxxxxxx>]

thanks!  I got some tech help from Orion (use the laser, don't worry
about the collimation eyepiece, check with a star test when possible.) 
The website below is very detailed and I've bookmarked it.
Wes

>>> phxjeff@xxxxxxxxxxx 4/7/2004 12:08:03 PM >>>
At 11:22 -0700 04/07/2004, Wes Edens wrote:
>After buying my 8" Orion Dob, I followed the manual's instruction on
>collimation (well, I didn't adjust the tilt of the secondary then.)
>Yesterday I got a deluxe (rear-view port) laser collimator from
Orion.
>I think I figured it out, and hopefully didn't burn any retina in the
>learning process.  I adjusted the secondary's tilt first of all--with
a
>little trouble.  I used a 2mm Allen wrench and loosened the set
>screws--it was hard to tell if I was loosening them much, but after
my
>efforts, I was able to get the secondary more centered than it
was--the
>laser dot is at least touching the paper circle Orion uses to mark
the
>center of the primary. (It was a lot farther away before). And I seem
to
>have got the set screws tightened so that it's held in that position
>firmly.
>On to the primary.  I figured out finally what the collimator
>instructions mean by getting the laser point into the hole.   I was
able
>to move the point into the hole so that I was left with a little
"black
>hole" type thing--black disk with the laser spraying out around it. 
>The trouble is, when I put on the manual Orion collimating cap, it
>doesn't look right.  The center of the primary is considerably off
the
>black dot in the middle (which I guess is the eyehole in the middle
of
>the collimation cap). I adjusted the primary so that it was centered,
>and of course now the laser said it was off.  I tried this a few
times,
>pushing Einstein's definition of insanity just a bit.
>Am I doing something wrong?  Any suggestions for this disagreement
>between the laser and the collimation cap?
>Thanks!
>Wes Edens

See

http://web.tampabay.rr.com/smilner/sherrod1/collimation.htm 

Jeff

-- 
Jeff Hopkins
HPO SOFT
http://www.hposoft.com/Astro/astro.html 

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