Re: help with adjusting secondary mirror

On 22 Feb 2007 10:42:19 -0800, "brucegooglegroups"
<brucegooglegroups@xxxxxxxxxxx> wrote:

..
Further help needed...
.
Could someone post specific directions on how to adjust the secondary?

Try this website by Robin Scagell:

http://homepage.ntlworld.com/robin.scagell/collimate.html


I have a skyquest 4.5 reflector, and the directions are not entirely
clear. As i noted in the previous posts, I can't seem to get the
secondary to hold its position.

You have to work the screws against each other to maintain tension.
There is one center screw that holds the entire secondary; this
presses the front of the secondary holder against three little allen
setscrews. You adjust these three screws until they hold the plate at
the correct angle; the central Philips head screw sets the master
tension.


Also- is it safe to look down the tube at the red laser dot? The dot
was slightly off center.

I don't know; I probably would not want to do it myself. What does
the instruction booklet for the collimator say about staring at the
light directly?

Well, hundreds of thousands of folks have, for the last century, gone
thru exactly the same agony you are enduring now, trying to collimate
their Newtonian reflectors. It is a bit hard to describe but once you
get the hang of it, the method will become extremely simple and
intuitive.

Surely there must be an astronomy club near you; there's probably one
in every corner of the whole world, and since Newtonian scopes are so
familiar, you will be able to get somebody to lend a hand. Just ask!
If it seems incredibly abstruse when reading instructions -- and it
sometimes is very hard to convey the steps you have to take,
especially if you have to go in a different order -- then it might be
a lot easier to watch somebody or have them direct you, step by step,
in person.

AstroApp
.

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