You are correct, sorry for the confusion! I am simply asking (after
ranting) how long of an exposure, UNGUIDED, can I expect with the GM-
8 with say a TV101 @ f4.5 with an ST-7 1x1 binned? I am currently
getting 60 sec 1x1 binned images using a CG-5 (with Vixen motors) and
the keeper rate is about 75%. With my new GM-8 I am getting 20 sec
images with the TV101 @ f4.5 and the keeper rate is only %50. My GM-
8 mount seems to have the dreaded "jumping" periodic error that is
not very periodic! Anyways, thanks in advance!!
Chris
--- In Losmandy_users@..., "Ray Porter" <ray_porter@u...>
wrote:
Paul,
I think Chris's question is why his cheap CG-5 seems to perform so
much
better than his new GM-8. Actually, he has a very specific
question. For
those who have used the GM-8 for unguided CCD imaging, what is the
longest
unguided exposure he should reasonably expect (assuming a good polar
alignment)?
================================================
Ray Porter
Applications Analyst Programmer
Administrative Information Services, UNC-CH
Phone: 966-5878
email: ray_porter@u...
dragon@e...
Home Page:
"Meddle not in the affairs of dragons,
for thou art crunchy and taste good with ketchup."
----- Original Message -----
From: "Paul Sterngold" <psterngold@y...>
To: <Losmandy_users@...>
Sent: Tuesday, September 12, 2000 4:19 PM
Subject: Re: [Losmandy_users] GM-8 RA problem...
I'm not seeing anything here involving Losmandy. Am I missing
something?
If
not, you might want to post this on one of the CCD lists on
eGroups.
Paul Sterngold
--- ccwoodruff@m... wrote:
Hello,
This is my first post here so please be patient! I have been
imaging
with a CG-5 and a Vixen GP using a C8 @ fl 630 and a TV 101 @
fl 400.
Using an ST-7 UNGUIDED I have achieve 1x1 binning images of a
duration at ~40 sec (C8) and ~60 sec (TV101) with about 75% good
image rate using the CG-5 (with Vixen Drives) and ~50 sec (C8)
and
~70 sec (TV101) using the Vixen GP (with Vixen Drives). I
purchased
the GM-8 mount becasue it is supposed to be a better mount
(which I
assumed in every way) than the CG-5 and the Vixen GP. So far
the
best I can do UNGUIDED with this mount is ~20 sec with the TV101
keeping only 50% of the images! Wow! At fl 400 using an ST-7
I am
seeing stars that do not move over the course of 5 minutes (so
I know
my polar alignment is at least pretty good) but are either
short lines
or egg shaped. Here are the things I have done to the mount to
try
and correct this (which in the end did help as my results
before were
even worse!).
1. Took apart, re-lubed.
2. Re aligned worm gear.
3. Swapped the RA / DEC motors.
4. Swapped the RA / DEC worms.
5. Tried overloading to the East.
Once again the best I could do is 20 sec. I have heard of
people
using the Vixen GP-DX @ fl 1000 for 3 minutes UNGUIDED and I am
wondering if since I like to do unguided work maybe that is the
mount
I really want for the scopes mentioned, at this point my CG-5
kicks
this mounts butt! Anyways, I guess what I'd like to know is am I
expecting too much out of this mount? What kind of UNGUIDED
results
are the group getting? Thank you very much for listening!!!
Sorry for the ranting!!
Chris Woodruff
www.ccwoodruff.com
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