Re: B+W Filter advice with Konica IR Film Sought...

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

On  1 Oct 96 at 19:14, Adam-HALPID Klyce wrote:

>      Hi all,
>      
>      I usually use Kodak's B&W and Color IR films but happen to 
>      have ten rolls of Konica 750nm in my fridge.
>      
>      I use B+W filters for my IR work and have gotten reasonably
>      good at using them. My question:
>      
>      What do people who use B+W filters and Konica film use as
>      ISO settings for each filter? (094, 099 ....)
>      
>      I am aware of several good filter oriented web-pages but I
>      only have e-mail so that does not help.

Adam, and other email-only members:

Not sure if it tells the entire story, but I would be happy to sent
you my filter conversion table by email. The HTML format is text
only, Notepad friendly, easy readable, and less than 20kB large I
believe. 

The B+W 094 for example equals Wratten #87A, the darkest filter in 
the Wratten system.

My bare meter reading starting point is 400 ASA, +3 stops for red 
#25, +4 for #87, +5 for #87C. No experience with the darker colors 
yet, but the entire range from light to dark is 25, 29, 70, 89B, 88A, 
87/C/B/A. I guess a rought start for 87A would be +7, ie 3 ASA, 
probably less since the film and filter curves are crossing eachother 
on the tails (weak sensitivity and weak transmission).

--
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. 11