Re: Slowest Commercial Film Available?

Hi Alex,

The MACO film is indeed very slow, and I observed a batch to batch variantion: the very first batch they made had a speed of about 6-12 asa (measuring IR light is kinda hard with ordinairy lightmeters), the newer batches were around 3-6 asa. The MACO film is basicaly (AFAIK) the "normal" EFKE PL100 panchromatic film , "doped" with IR sensitive dyes. With the red filter you basically cut off the visible light, and reduce the sensitivity greatly (the more red the filter, the lower the speed, I use a 70 filter, roughly between a 25 red filter and a 89b filter IIRC..). Since the amount of IR light varies, depending on the time of the day and the season I tend to overexpose also (what's the difference between slow and very slow anyway..;-)..). The highlights do not block up that dramatic as with kodak HIE, which has a very pronounced shoulder. And I process this film in PyrocathHD, which lowers the highlights on VC paper...

..probably more than you wanted to know..;-)..

Best,

Cor

> -----Original Message-----
> From: Alex Swain [mailto:fotoobscura@gmail.com]
> Sent: maandag 7 maart 2005 14:41
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Slowest Commercial Film Available?
>
>
> my god that is slow. Thats the published speed of the film?
>
> wow. gotta play with that stuff more.
>
>
> --
> Cheers,
> Alex Swain (fo)
> Burlington, VT
> http://www.zoom.sh
>
>
> On Mon, 07 Mar 2005 12:53:42 +0100, Breukel, C. (HKG)
> <C.Breukel@lumc.nl> wrote:
> > JD,
> >
> > A bit late her, but in my hands: MACO 820 IR (depending on
> the red filter ofcourse, in my case a 70 filter), 1.5-3 asa.
> > and APH lith film, processed in LC1 for cont. tone 1.5 asa,
> >
> > best,
> >
> > Cor
> >
> > > -----Original Message-----
> > > From: Jeff Sumner [mailto:jdos2@mindspring.com]
> > > Sent: vrijdag 4 maart 2005 17:21
> > > To: alt-photo-process-l@sask.usask.ca
> > > Subject: Slowest Commercial Film Available?
> > >
> > >
> > > Anyone have experience with the slowest commonly
> available film, or
> > > information how to pull process further any film below the
> > > recommended
> > > Ilford Pan F 25ASA? 120/220, 135 and sheet film emulsions are
> > > what I'd
> > > be using.
> > >
> > > Thanks!
> > > JD
> > >
> > >
> >
>
Received on Mon Mar 7 08:16:00 2005