RE: [APML] Help with M8 on Tech Pan

["Thom Iwancio" <tiwancio@sc.rr.com>]

Thanks Jerry, why is it the answer that makes the most sense is always
the one you don't want to hear.  Arrrgggg....

Short of the humidity concerns, hand processing is probably the thing
that has the most inconsistency to it for me.  I mix and control
temperature like it is a religion and try to do the same with the
agitation but you can't compare hand agitation with drum processing. The
drill for me is to:
1) pour
2) twist 3-4 times
3) tap
4) invert once (about one second over and one second back up)
5) invert once every minute thereafter (same speed as above)

What do you recommend I try differently?  Invert less often or more
slowly? Forget the twists?
BTW, development was 12 minutes, HC-110 dilution B @ 68 F.

Thanks again,

Thom Iwancio
Elgin, SC
www.machunter.org
home.sc.rr.com/thomiwancio


-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of Jerry Lodriguss
Sent: Sunday, September 21, 2003 9:56 AM
To: Discussion of Film Astrophotography
Subject: Re: [APML] Help with M8 on Tech Pan

Hi Thom,

You definitely have vignetting in the optical system.

There is field rotation from inaccurate polar alignment.

The uneven dark and light areas at the top and bottom of the frame are 
processing artifacts from over-agitation and uneven development near the

sprocket holes in the film. You will only find this in areas of the film

with density, so that is why you don't see it on the unexposed frames.

Jerry




At 08:37 AM 9/21/2003 -0400, you wrote:
>Hey gang, looking for someone to take a look at my latest image and
tell
>me what I am seeing.  I am not sure if it is vignetting, uneven
>hypering/processing or just part of the star clouds in Sagittarius.
>There are way to many variables with TP as compared to E200 slides.
>
>The unexposed frames all have even density so I don' think it is the
>hypering or processing.
>
>The image is M8, 45 minutes through a Meade 8" with a Lumicon Easy
>Guider, focal reducer in the f6 position.  Hypering was 96 hrs, 50 C,
>Lumicon 8% forming gas @ 3 psi.  Scan was reduced to 8 bit in order to
>save as a jpg and resized to 1024 x 697 with no other processing.  I
can
>email the full 9 meg scan if anyone is interested.
>
>http://home.sc.rr.com/thomiwancio/images/M8TechPan1024.jpg
>
>I still have guiding and focus issues to resolve, but I fell like I am
>slowly making progress.
>
>Thanks in advance,
>
>Thom Iwancio
>Elgin, SC
>www.machunter.org
>home.sc.rr.com/thomiwancio
>
>
>
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