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Subject: [M]: Fw: 12" Lx200 optical train questions
From: David Power
Reply To: mapug@shore.net
Date: Sun Jun 03 08:43:16 2001
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Am I missing something basic here?
After adding a secondary focuser I've noticed that I can no longer swing =
the OTA through the forks when using a diagonal. Not being a wedge user =
yet I'm curious as to how you would polar align a 12' with a long =
optical train.=20
Is it common to strip off the Optical train and drift align and then =
install the secondary focuser, flipper, camera etc.? Or are all the =
people with long optical trains mounting it on a pier so it stays =
aligned (seems far fetched to me).=20
Is this why the GEM mounts seem to be so popular with the ccd crowd. =
I've seen some pictures that show optical trains that have to be 18 =
inches long with focusers, cameras, filter wheels and such.
How do you keep the scope from slamming the optical train against the =
base, other than the obvious. Is it possible to set up some user defined =
stops?. I've underestimated the angle on an object that's almost over =
head and have slammed it a couple of times now and that cant be good for =
the dec motors.
David
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<DIV><FONT face=3DArial size=3D2>Am I missing something basic =
here?</FONT></DIV>
<DIV><FONT size=3D2><FONT face=3DArial></FONT><FONT=20
face=3DArial></FONT><BR></FONT></DIV>
<DIV><FONT face=3Darial,helvetica size=3D2>After adding a secondary =
focuser I've=20
noticed that I can no longer swing the OTA through the forks when using =
a=20
diagonal. Not being a wedge user yet I'm curious as to how you would =
polar align=20
a 12' with a long optical train. </FONT></DIV>
<DIV><FONT face=3Darial,helvetica size=3D2>Is it common to strip off the =
Optical=20
train and drift align and then install the secondary focuser, flipper, =
camera=20
etc.? Or are all the people with long optical trains mounting it on a =
pier so it=20
stays aligned (seems far fetched to me). </FONT></DIV>
<DIV><FONT size=3D2><FONT face=3Darial,helvetica>I</FONT><FONT=20
face=3Darial,helvetica>s this why the GEM mounts seem to be so popular =
with the=20
ccd crowd. I've seen some pictures that show optical trains that have to =
be 18 inches long with focusers, cameras, filter wheels and=20
such.</FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>How do you keep the scope from slamming =
the optical=20
train against the base, other than the obvious. Is it possible to set up =
some=20
user defined stops?. I've underestimated the angle on an object that's =
almost=20
over head and have slammed it a couple of times now and that cant be =
good for=20
the dec motors.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>David</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV></BODY></HTML>
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