Re: SFX film and IR filters

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

On 20 Apr 99 at 8:29, Paul Freeman wrote:

> 
> Hi,
> 
> Does anyone have any experience with Ilford SFX film. I think that I
> read somewhere that it can benefit from exposures made with an 89
> filter.

Yup, Wratten #89B is about the limit for SFX, showing its full 
pseudo-IR potential ('pseudo' because it stops at 720nm, while IR 
starts at 780nm, but the Wood effect of foliage starts at 695nm 
already, so you can record that, even though it is not true IR).
 
> Any idea of what, roughly, exposure times should be?

I thought I had SFX also listed in the overview of IR-filter/asa data 
on my homepage, but both Agfa APX200S and Ilford are missing.
I recommend you subscribe to the Infrared Photography Mailinglist to 
get a good opinion on exposure times, see my homepage for details how 
to subscribe:

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

 

--                 
Bye,

Willem-Jan Markerink


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


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