Re: Colour Infrared

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 11 Nov 96 at 22:49, Robert Long wrote:

> The recommended Wratten 12 ("minus blue") filter yields the cleanest,
> most sparkling colors IMHO, but this is a subjective call.  Others
> have reported liking their results with the orange filter.

To list all inbetween colors:
#8 yellow
#12 medium yellow
#16 dark yellow
#21 orange

I only used #21 thusfar, but I agree that less orange could improve 
the color contrasts. But Cokin only offers #8 and #21, but recently I did find 
a solution for #12 and #16 in Cokin-P resin. 

Note that this film reacts very strongly to minor spectral changes,
simply because it hasn't a continuous sensitivity as normal slide
films. So filters differing by 50nm can yield effects much stronger 
than on normal film.
My reason to go with #21 back then was that #8 was way too blue, very 
cold slides....<yuk>. But #21 almost spoils the image again with an entire 
orange cast. Very picky film. Hope to run some tests this winter with 
#12 and #16.
Oh, and my EI was 100 ASA (sorry Joe....;-))
Most literature indicates 125 ASA btw.
Bracketing should definately not be as strong as with HIE, as slide 
is much more sensitive to correct exposure. Luckily it doesn't react 
as much to IR-differences, since it records most of the spectrum when 
using an medium yellow filter.

 
> |Where can I get this film developed (preferably in Canada)?  Is it =
> possible
> |to use E6 with it?  Can it be cross processed in C41?
> 
> E6 won't work, as I understand it.  There was an article on this list
> a few months ago by Jesse David Andrewartha about processing the
> transparency material as negative material (with a higher effective
> EI), but it did not entail a straight C41 process.  If anyone is
> interested, I saved the post and can repost it, unless the original
> author would prefer to do so.

I believe some, or most, of Jesse's formula's are listed in one or 
more articles on my homepage:

http://www.a1.nl/phomepag/markerink/mainpage.htm

One formula that still has to be added is a formula to develop IE as a 
negative film, according to my German literature with good results. 

Beyond that, bio- and medical universities and research centers 
should be able to process this film, and might be willing to help 
you. And I am sure there are several people on the list who can point 
you to commerical lab's in Canada as well.

--
Bye,

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      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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Topic No. 6