RE: [APML] The Veil...

["Scott Hammonds" <capella@creatorsview.com>]

Don,
I have piggy-backed my NP101 on top of my LX200 10". Alignment between
the 2 shouldn't make any difference unless it's way way off. It sounds
like the polar alignment was not the problem. 

How about flexure? I've been fortunate that using the DR125's to hold my
NP101 has not caused me any problems, but I've only done it a few times.

I'm sure you know the drill, start by process of elimination. You can
probably do the whole dry air purge thing for about $75, not sure about
the nitro purge.

Scott Hammonds

 

-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of Don Spencer
Sent: Friday, May 30, 2003 11:01 AM
To: Discussion of Film Astrophotography
Subject: Re: [APML] The Veil...

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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