Re: M81 and M82 Images with Traveler and 155EDFS

Ray Gralak <ray@...>

Hi Andy,

I currently use a JMI DRO focuser controlled through 100 feet of cable.
However, I am planning soon to move to the RoboFocus product from HomeDome
to take my automation one step further.

When establishing polar alignment (my setup is temporary) I only use the
minimum 6 stars. After I obtain a polar alignment within one arc-minute
I do one more run of about a dozen stars then every time I image a new
target I add a map point for it. Typically I get an RMS of around 40
although this last time I'm at just over 20 arc-sec.

Two things worth mentioning: 1) this is with my 155EDFS refractor, AP Rings,
AP 18" Heavy duty mounting plate, and ST-8E CCD camera sitting on my 1200GTO
so there is no mirror flop and I'm "overmounted", and 2) I use the shortest
AP pier
made so that the mount is as stable as possible.


-----Original Message-----
From: Andy Forsberg [mailto:CS-Imaging@...]
Sent: Monday, January 08, 2001 5:21 AM
To: ap-gto@...
Subject: RE: [ap-gto] M81 and M82 Images with Traveler and 155EDFS

How do you remote focus the instrument? How long are your serial cables
from the computer to the mount? How many TPoint targets to you take in a
run for polar alignment?

Thanks Andy

Also, if you ever hope to go remote with your mount the
1200 is a better choice. I've taken mine with me on perhaps
10 remote trips. You will not have that ability with the

And by the way, I use all of the Bisque software with no
problems. I've been using TPoint lately to refine my
polar alignment to within 1 arc-minute and pointing
accuracy to any part of the sky to less than 20-arcseconds
with my 155EDFS on the stock AP pier setup in my backyard.

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