RE: [APML] Help with M8 on Tech Pan

[Jerry Lodriguss <jerry@astropix.com>]

Hi Thom,

It doesn't sound like you are over-agitating with the process you use, but 
techpan is very touchy at the amount of development used for deepsky.

I will defer to the techpan experts here and let someone with more 
knowledge give you advice on agitation. Maybe Chuck could comment.

Jerry



At 10:39 AM 9/21/2003 -0400, you wrote:
>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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