Re: [APML] The Veil...

["Don Spencer" <ecdon@cox.net>]

Scott,
          I had solid 15 minute no-drift in both axis, but, I did fail to
check to see if both the Astroview and LX200 were aligned properly. The
Astroview is always mounted in a set of dr125 rings, and had been aligned
with the 12" last time I was out, but could have moved slightly in
transport. It's in my check list, but I must have missed it. Also, going
back to my notes..I removed the camera right before this shot was taken, to
check for dew on the lenses, so there is a good possibility that I didn't
seat the adapter correctly...
Don Spencer
----- Original Message -----
From: "Scott Hammonds" <capella@creatorsview.com>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Friday, May 30, 2003 7:50 AM
Subject: RE: [APML] The Veil...


> The scope listed is an Orion Astroview piggy-backed on an LX200, is this
> correct? Could there be polar alignment problems here? I have had dew
> problems that caused pretty severe curvature at the edges of the image,
> that's why I went to the dry air purge system.
>
> Scott Hammonds
>
>
>
> -----Original Message-----
> From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
> On Behalf Of Chuck Vaughn
> Sent: Friday, May 30, 2003 10:12 AM
> To: Discussion of Film Astrophotography
> Subject: Re: [APML] The Veil...
>
> Don,
>
> It looks to me that the photo is just out of focus. Since you're using
> an SCT with no field flattener (I assume), it's not possible to get the
> whole frame in focus at the same time. Normally the image will be in
> focus in the center and out of focus as you move toward the corners due
> to field curvature. You have the opposite. I'd look carefully at your
> focusing method before film buckling unless your camera body is poor at
> holding the film flat. I've never heard of a Pentax Spotmatic but I
> assume it's 35mm. Film buckling of this severity with a 35mm camera
> would be unusual.
>
> Chuck <aa6g@aa6g.org>
>
> --------------------
>
> > Hi All,
> >           I just finished processing my first attempt at shooting the
> > Veil.
> > http://members.cox.net/ecdon/veil.html
> > You'll notice in this shot that the center seems a bit out of focus,
> > the
> > edges focused real well, but somewhat rotated. This is the second shot
>
> > from
> > that night that has this appearance, which leads me to believe that
> > dew was
> > the culprit(it formed earlier and stayed longer the 2nd night I was
> > out). By
> > comparison, my M8/M20 photo shows slight curving at the edges and dew
> > was
> > just starting to pick up at the time the photo was shot. I also
> > learned a
> > valuable lesson...it is better to take multiple shots of one area,
> > stack
> > them, and get a quality photo, than it is to spend 2 nights shooting 1
>
> > shot
> > of anything in site! I am battling noise in both my Antares region and
> > IC4592 shots.
> > Thanks,
> > Don Spencer
>
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