Re: IR and Flash Photography

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

On 18 Aug 96 at 17:27, Russ Rosener wrote:

> 
> >BTW, my darkroom specialist friend ran some more extreme tests with
> >SFX. He used a B+W 093 filter (equals #87C), and got an effective
> >film sensitivity of -30 DIN (yes 'minus'!). I believe he said he
> >exposed for 4 minutes (f5.8-8 I guess), and developed the film for
> >about 30 minutes....8-))
> >Also a nice testimonial that ASA is worthless in some cases....you
> >need a calculator to read the same in (fractions) of ASA....;-))
> 
> This seems to imply that SFX is not a truly infrared film as the Ilford
> company rep. in my area told me. Seems to me that if you are getting
> NEGATIVE ISO readings, the film is way beyond its parameters. How did your
> friend's negatives
> look? Did he get some good results, or just mush?

It was never intended/marketed as a deep-infrared film, only as a 
Konica equivalent, but with much higher speed.
Note that you can also use Konica with at least a #87 filter, but 
again: fractions of ASA. 
I have not yet seen my friends neg's, but other than the hassle of 
exposure and development, he didn't sound too dissapointed.
I forgot to ask him about the Konica in the same conditions. Curious 
if he can compare them.

--
Bye,

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The difference 
between men and boys
is the price of their toys

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

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Topic No. 12