| |
[index]
[month]
[prev]
[next]
[thread-next]
Subject: [M]: Polar alignment and collimation
From: Dr. Michael Blaber
Reply To: mapug@shore.net
Date: Sun Feb 18 07:45:38 2001
|
While you're here, how about checking out the
Astronomy Book
List ? |
This is a multi-part message in MIME format.
------=_NextPart_000_0006_01C0998F.8CDDE7E0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Greetings
I have a questions about effects of collimation upon alignment of the =
telescope. I just spent several hours getting a precise polar =
alignment. My next goal was to collimate the scope (LX-200). However, =
I had a horrible thought that if I adjusted the secondary mirror, the =
polar alignment would be compromised. I suspect the best order is to =
collimate first, then align. I have tried to think through this, and =
believe that collimation will not actually affect the alignment, but am =
not 100% sure of this. Does anyone know for sure? =20
Also, with regard to collimation of the LX-200: on bright stars I can =
see some color aberation (red cusp on one side of a star, blue on the =
other). How much of this is unavoidable. In other words, would this =
disappear with accurate collimation, or is some aberation just a fact of =
life with this type of scope?
Thank you
Mike Blaber
------=_NextPart_000_0006_01C0998F.8CDDE7E0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Greetings</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I have a questions about effects of =
collimation=20
upon alignment of the telescope. I just spent several hours =
getting a=20
precise polar alignment. My next goal was to collimate the scope=20
(LX-200). However, I had a horrible thought that if I adjusted the =
secondary mirror, the polar alignment would be compromised. I =
suspect the=20
best order is to collimate first, then align. I have tried to =
think=20
through this, and believe that collimation will not actually affect the=20
alignment, but am not 100% sure of this. Does anyone know for =
sure? =20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Also, with regard to collimation of the =
LX-200: on bright stars I can see some color aberation (red cusp =
on one=20
side of a star, blue on the other). How much of this is =
unavoidable. =20
In other words, would this disappear with accurate collimation, or is =
some=20
aberation just a fact of life with this type of scope?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Thank you</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Mike Blaber</FONT></DIV></BODY></HTML>
------=_NextPart_000_0006_01C0998F.8CDDE7E0--
View index by [date] [author] [subject]
Previous message: [M]: Dec problem, Uwe Nehmeyer
Next message: Re: [M]: Lx200 demo party, amnet_ed
Next message in thread: [M]: Re: Polar alignment and collimation, Blair MacDonald
|
|