Re: quick question.. Developing Kodak IR...

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 4:31 pm +0100 12/12/99, Marco Pauck wrote:

>Eckhard Stephan wrote:
>> I don't want to start that discussion from the Yahoo Infrared club
>> (http://clubs.yahoo.com/clubs/infraredvisionsanddreamscapes) about the
>> "right" dev. time again, but... ;-)
>> The "Massive Dev Chart" (http://www.digitaltruth.com) recommends 11 min.
>> at 20=B0C / 68 F. So do Laurie White and Joe Paduano in their Infrared
>> photography books. ;-)
>
>Yes, 11 min was Kodak's original recommendation. They changed it
>later (about 1997) to 8.5 min. (See also the references in
>http://www.pauck.de/marco/photo/infrared/comparison_of_films/comparison_of_= films.html
>.)
>
>> If you follow Kodak's exposure instructions, IMO 8,5 min. with D-76 are
>> definitely too short. Don't know why they give this recommendation -
>> AFAIK the other dev. times on the info sheet (e.g. for XTOL) are
>> "correct".
>
>Agreed.
>
>	Marco


The Infrared FAQ has the original Kodak recommendation for 11 minutes in D76 at 20C in the section describing the film.=20

John Mided of the "Massive Dev Chart" was kind enough to contribute his tables for infrared film developers to the Infrared FAQ - this states 11 to 12 minutes at 20C.

There is also a downloadable PDF file of the most recent Kodak data sheet for HIE on the FAQ page and this recommends 8.5 minutes at 20C.=20


There is a side noteto the Kodak data sheet however "The various pictorial, scientific, and technical applications of this film may require negatives of different contrast indexes. The following starting-point recommendations are intended to produce a contrast index close to that listed in the table. Make tests to determine the best development time for your application. Note: Development times shorter than 5 minutes may produce unsatisfactory uniformity".

I use 11 minutes at 20C.


All the best,

Clive   http://www.cocam.co.uk
Photographic Services, Filters and Equipment, Infrared FAQ
http://clive.bel-epa.com
Adventures in Cyberspace - Digital Art and Photos

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