Re: Konica IR 750

[Hannu Jarventaus <teklahj@xxxxxxxx>]

On Wed, 25 Sep 1996, George Ling wrote:

> Thanks for sharing your experience on the Internet.  I like to try this
> Konica 750 film, and I have a few questions to clarify my understanding.
> This is because you have results to verfiry for what you did, and I
> would like to dupicate your effort for some good IR shots also - white
> leaves and black sky!
> 
> (1) is B+W 091 filter the same red as the Hoya/Tiffen #25 red filter?
> (2) If I remember correctly, the instruction sheet said the ISO is 32. 
> But you have set your ISO to 100 on the camera, and meter it through the
> red filter. Is this correct?
> (3) You use Agfa Rodinal (1+25).  Does this mean 1 part Rodinal with 25
> parts water?
> (4) Have you tried other developer?
> 
> Thanks in advance!
> 

I recommend that you read WJ's homepage in the web 
(http://www.a1.nl/phomepag/markerink/mainpage.htm), if you can.
There is information about filters and link to IR FAQ.
So you can have answers to these questions, but one problem is,
that you might have several different answers.
You have to experiment anyway to find out what are the results
you like best...   ;-)

If you are trying Konica IR 750 (or any other ir-film) for the first 
time, you should bracket your exposures. After developing the film 
you can see what was the best exposure.

My answers to your questions: 
(1) B+W 091 filter is more like #29, and it is darker red than #25.
    I have used Hoya 25A and Cokin 003 with this film, but I think
    091 gives a little bit more effect.
(2) The instruction sheet gives ISO 32 (without red filter), but I set
    ISO 100 on the camera and meter through the lens with red filter.
    This works best for me.
(3) Yes.
(4) Yes. Ilford Ilfotec LC29 (1+19) 5 min.
         Ilford ID-11 6 min.
         Kodak D-76 6 min.
         Kodak TMAX 5 min.
         Agfa Rodinal (1+25) 5 min.   (this is my favourite)



hannu.jarventaus@xxxxxxxx

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Topic No. 22