Re: [APML] needed- an excellent sense of direction

["Bobby Middleton" <bobm@koyote.com>]

From: John C. Mirtle <jmirtle@shaw.ca>

> Bobby;
>     I'm having a hard time picking up a pattern with the 'non-round'
stars. How
> were these images stacked? Was it manual registration or Registar?

Registar. The pattern is on both negatives and is similar. Three screws are
bad huh?? That's a new one on me. You were getting some flexure on your
shots? Do you agree with Dave on the placement; 90-120 degrees apart?
Bobby

> It might be
> easier to get a handle on what is going on with a single negative. I have
to
> agree with Dave that using 3 lock screws can be a source of trouble. This
simple
> realization would have saved probably half of my cold camera shots. Some
of them
> looked like the focal plane was tilted, or would just show as severe coma
on
> part of the image. 3 lock screws are better than one, but two definitely
seem to
> give a more stable/flat connection for OAG's, guide scopes, etc. Maybe
give it
> a try using only 2 of the lock screws on the top of your focuser. Good
luck! :-)
>
> John Mirtle
> Calgary, Ab. Canada
>
> ----- Original Message -----
> From: "Bobby Middleton" <bobm@koyote.com>
> To: <astro-photo@seds.org>
> Sent: Wednesday, January 09, 2002 12:36 PM
> Subject: [APML] needed- an excellent sense of direction
>
>
> > Here's one for the guys with a real good sense of direction. I've got an
> <- snip ->
> > I'm sorry for such a laborous description, but I'm in hopes that someone
can
> > get the directional bearings on where my image lies on the film plane,
and I
> > can get an idea of which two corners on my focuser are off. I've had
this
> > mis-alignment ever since I got the newt.
> > Bobby Middleton
> >
> >
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>
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