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Re: [APML] Letter to Kodak.
Here you go, I copied APML in case anyone else wants to
contact him....
Kodak Information Center
Protech
Attn: Pete Vimislik
800 Lee Road
Door C
Rochester, NY
14650
Thanks!
George Anderson wrote:
>
> Jason
>
> Can you give me the full name, title and mailing address of Pete at
> Kodak?
> I'd like to send a lettr to him via snail mail.
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
> Jason Ware wrote:
> >
> > To be sent tomorrow, FYI.....
> >
> > > Dear Pete
> > > Please find enclosed a sample of tech pan as we disused.
> > >
> > > Here is the background:
> > > Astrophotographers have been hypersensitizing tech pan successfully for many years. Around 1998 (or so) we started noticing a problem with the 120 version. After hypering and developing we found a mottling effect along with what appeared to be the frame markings transferred to the film. A call to Kodak at that time revealed that the ink had been changed and that a backing change should fix the problem and indeed it seemed to. For a couple of years the new backing did its job and we were able to hyper and use the film with excellent results.
> > >
> > > Fast forward to 2002. In preparation for a star party in May, I hypered several rolls, some of which I had stored in the freezer and some I had purchased from a dealer in Dallas. After exposing and developing the film I found that the rolls that had been recently purchased showed the mottled effect along with the frame number transfer, although it was not as bad as what we experienced in 1998. Further investigation showed that the rolls I had stored in my freezer were of the same emulsion batch as the dealer’s (I had purchased it from them about a year before). He had stored his at room temp.
> > >
> > > I had not done much with the film in the last couple of years but would like to begin using it again in a 120 roll back I have for one of my telescopes. Last summer I ordered 10 rolls from Adorama and found it had the same problem. Thinking that I again had received old film I requested two sample rolls from Kodak and received them on Friday, May 7, 2004. I hypered one of them and found the same problem.
> > >
> > > I have enclosed several samples as follows:
> > >
> > > 1) Unused box, emulsion number: 0451061 received from Kodak on May 7.
> > > 2) Unexposed, hypered roll as follows….
> > >
> > > Unrolled in total darkness and placed on a reel. Exposed to high-vacuum for 2.5 hours.
> > > Hypered at 50 degrees
> > > Centigrade for 36 hours. 80%N2, 20%H2 Forming gas. Re-rolled.
> > >
> > > 3) Short strip of #2 above unexposed, developed for 8 minutes D19 at 68 F.
> > >
> > > 4) Sample strip from emulsion number 0461001 UNHYPERED, developed D19 for 60
> > > minutes at 68F. NOTE that this batch, when hypered, shows the same effect.
> > >
> > > From the samples above I have the following theory…..
> > >
> > > 1) As you can see from #4 sample that extreme development of UNHYPERED 120 Tech Pan
> > > does not show any mottling effect or frame data transfer.
> > >
> > > 2) On the other hand 120 tech pan HYPERED shows the effect.
> > > I believe that the ink is indeed being transferred to the emulsion after manufacture
> > > while being stored. If the user is lucky enough to get a very fresh batch
> > > (only days old perhaps?) then freezing may stop the transfer.
> > >
> > > 2) I believe that the ink, in the emulsion does not affect normal use, however prevents the
> > > forming gas from penetrating the emulsion and therefore reduces the hypering effect. Note
> > > that the frame data and words “Kodak” show as LIGHTER than the hypering induced base
> > > fog.
> > >
> > > Questions:
> > >
> > > 1) Can Kodak change its manufacturing process to prevent this? (different ink?)
> > > 2) If not can the users obtain tech pan without the backing (to be added after hypering)?
> > > 3) Is there a way to “clean” the film before vacuum and hypering?
> > >
> > > Thank you for looking into this and I hope you can help us find a solution. Many astrophotographers have all but given up using this wonderful film.
> > >
> > > Regards,
> > > Jason Ware
> >
> > --
> > -Jason Ware
> >
> > ---------------------------------------------------------
> > VISIT MY ASTROPHOTOGRAPHY HOMEPAGE!!
> > ASTRO IMAGES FOR DOWN-LOAD, TIPS, REPRINTS
> > URL: http://www.galaxyphoto.com
> > ---------------------------------------------------------
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> > _______________________________________________
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> > http://seds.org/mailman/listinfo/astro-photo
--
-Jason Ware
---------------------------------------------------------
VISIT MY ASTROPHOTOGRAPHY HOMEPAGE!!
ASTRO IMAGES FOR DOWN-LOAD, TIPS, REPRINTS
URL: http://www.galaxyphoto.com
---------------------------------------------------------
My Other Hobby....High Power Rocketry
URL: http://www.galaxyphoto.com/rockets
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