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Hello Rod,
Thanks for the reply.
The distance from the baffle end towards the outer shell (alu =
tube)differs 4 mm to one side and the other. I measured this at the end =
of the baffle closest to the corrector plate.
Yes, I can collimate the optics. But I assume if the mechanical axis is =
of centre, it has negative influence on the optical performance.
regards,
Rob van Vreden
----- Original Message -----=20
Sent: Sunday, August 31, 2003 11:46 PM
Subject: Re: [M]: baffle tube off center
In a message dated 8/30/03 12:07:35 PM Central Daylight Time, =
I have a 10" about 7 yrs old, where the baffle tube is 4mm off =
centre. I measured this at the end of the tube (the side nearest to the =
corrector plate) and the aluminium shell. Since there is not a way to =
adjust the baffle tube in the rear cell, I was wondering what causes =
this offset. Since the baffle is screwed into the rearcell, there is not =
much to correct, I thought maybe the aluminium outer cell is not square. =
Or are there other reasons for this mechanical offset?
I feel 4mm mechanical offset is much, and want to find ways to =
correct that.
Has anybody seen this before, and knows how to deal with it?=20
Another thing: is the aluminium outer shell glued to the rear cell? =
Since I fail to split it from the rear cell.
=20
Hi:
Off center with regards to what? Can you collimate the scope? If so, I =
wouldn't worry too much. Yes, most scopes, Celestron and Meade, I've =
seen over the years have rear cells that are both glued and screwed.
Peace,
Rod Mollise
Author of _Choosing and Using a Schmidt Cassegrain Telescope_
Like SCTs and MCTs? Join SCT User, the Mailing List for CAT Fanciers!
<http://members.aol.com/RMOLLISE/index.html>
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<STYLE></STYLE>
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hello Rod,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Thanks for the reply.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The distance from the baffle end =
towards the outer=20
shell (alu tube)differs 4 mm to one side and the other. I measured this =
at the=20
end of the baffle closest to the corrector plate.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Yes, I can collimate the optics. But I =
assume if=20
the mechanical axis is of centre, it has negative influence on the =
optical=20
performance.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>regards,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Rob van Vreden</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, August 31, 2003 =
11:46=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [M]: baffle tube =
off=20
center</DIV>
<DIV><BR></DIV><FONT face=3Darial,helvetica><FONT lang=3D0 =
face=3DArial size=3D2=20
FAMILY=3D"SANSSERIF">In a message dated 8/30/03 12:07:35 PM Central =
Daylight=20
Time, <A =
writes:<BR><BR>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px"=20
TYPE=3D"CITE">I have a 10" about 7 yrs old, where the baffle tube is =
4mm off=20
centre. I measured this at the end of the tube (the side nearest to =
the=20
corrector plate) and the aluminium shell. Since there is not a way =
to adjust=20
the baffle tube in the rear cell, I was wondering what causes this =
offset.=20
Since the baffle is screwed into the rearcell, there is not much to =
correct,=20
I thought maybe the aluminium outer cell is not square. Or are there =
other=20
reasons for this mechanical offset?</FONT><FONT lang=3D0=20
style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D3=20
FAMILY=3D"SANSSERIF"><BR></FONT><FONT lang=3D0 =
style=3D"BACKGROUND-COLOR: #ffffff"=20
face=3DArial color=3D#000000 size=3D2 FAMILY=3D"SANSSERIF">I feel =
4mm mechanical=20
offset is much, and want to find ways to correct that.</FONT><FONT =
lang=3D0=20
style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D3=20
FAMILY=3D"SANSSERIF"><BR></FONT><FONT lang=3D0 =
style=3D"BACKGROUND-COLOR: #ffffff"=20
face=3DArial color=3D#000000 size=3D2 FAMILY=3D"SANSSERIF">Has =
anybody seen this=20
before, and knows how to deal with it? </FONT><FONT lang=3D0=20
style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D3=20
FAMILY=3D"SANSSERIF"><BR><BR></FONT><FONT lang=3D0=20
style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D2=20
FAMILY=3D"SANSSERIF">Another thing: is the aluminium outer shell =
glued to the=20
rear cell? Since I fail to split it from the rear cell.</FONT><FONT =
lang=3D0=20
style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D3=20
FAMILY=3D"SANSSERIF"><BR> <BR></BLOCKQUOTE><BR></FONT><FONT =
lang=3D0=20
style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D2=20
FAMILY=3D"SANSSERIF"><BR>Hi:<BR><BR>Off center with regards to what? =
Can you=20
collimate the scope? If so, I wouldn't worry too much. Yes, most =
scopes,=20
Celestron and Meade, I've seen over the years have rear cells that are =
both=20
glued and screwed.<BR><BR>Peace,<BR>Rod Mollise<BR>Author of _Choosing =
and=20
Using a Schmidt Cassegrain Telescope_<BR>Like SCTs and MCTs? Join SCT =
User,=20
the Mailing List for CAT=20
=
Fanciers!<BR><http://members.aol.com/RMOLLISE/index.html><BR></BLOC=
KQUOTE></FONT></FONT></BODY></HTML>
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