[AZ-Observing] Re: Help with trailed images
- From: "Bernard Miller" <bgmiller011@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Tue, 14 Oct 2014 08:55:45 -0700
Steve,
You could be experiencing differential flexure. Since you have two telescopes,
they can move independently. Since we are talking microns here, it does not
take much wiggle in any of the connections to get flexure. It is the main
drawback of using a separate guide scope and is difficult, if not impossible to
completely remove. It is the main reason people use OAG. It removes flexure.
Thanks,
Bernard
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of
stevecoe@xxxxxxxxxxxxxxxx
Sent: Monday, October 13, 2014 11:20 PM
To: Org, Az-Observing@Freelists.
Subject: [AZ-Observing] Help with trailed images
Howdy folks;
I need some help. I took three 4 minute exposures tonight from the RV park in
Wickenburg. They are all trailed quite a bit.
I bought a guide scope and rings from Scott Stiers at the club meeting and it
set up nicely. So, I am guiding with a Short Tube 80 from Orion and using a 2X
barlow and a 12mm cross hair eyepiece. I have auto guiding in my future I just
wanted to see if it all worked with manual guiding tonight.
I took the images with a Vixen 80mm refractor and a 0.7X reducer and my Canon
T2i camera. I used the Celestron Polar Align routine in the firmware, just
like always.
Here is the mysterious part. Through the crosshair eyepiece and the 2X Barlow,
the guide stars I used never left the box. The guiding looked really good. I
was expecting some good results.
How can the guide star stay centered and the images wind up trailed??
I thought that I tightened up all the little set screws and the ring screws for
the guidescope. I balanced the set up and it all moved nicely from object to
object. I don't think it is any kind of flexure, I won't know where to look.
If looking at one of the shots would be helpful, send me an offlist email and I
will attach one for you.
Thanks;
Steve Coe
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