Re: [APML]: drift allignment

["Bobby Middleton" <bobbym@webwide.net>]

----------
 
 
 From Bobby Middleton
 ----------
 >
 > > 
 > > >I got several pics developed today
 > > >and was quite pleased except for the field rotation that showed up.
 I'm
 > > >trying to nail down my permanent allignment and am not quite there
 yet.
 
 From Mike Caligiuri
 > > 
 > > Differential field rotation could stem from selection of guidestar
 > located
 > > "away" from target object, even with perfect alignment.  Are you using
 a
 > > guidescope or OAG?
 > 
 
 
 I was guiding through the Lumicon GEG with a 10" lx200 f/10 reduced to
 f/6.6.  

>From Michael Covington: 
 
> > Query #1: Do the stars seem to twirl around the guide star or around
the
> > center of the field?  (Or maybe the guide star is in the center of the
> > field and
> > you can't tell.)
 
Welcome back, Michael, 

 the stars trail only at the outside of the photos in short arcs that seem
 to radiate from the center of the photo. It seems only to be noticable on
 the dimmer stars, the larger, brighter ones aren't as noticible.
 
 > 
 > Query #2: What kind of lens?
 > 
 
 I was at prime focus.
 
 Bobby Middleton
 bobbym@webwide.net