Ilford SFX 200 in ColorFoto 7/97

[Helmut Faugel TE <htf@xxxxxxxxxx>]

As I wrote in one of my mails, the german photomagazine 'ColorFoto'
tested Ilfords SFX 200.

Ilford SFX 200 is compaired to two films, Ilford FP4 plus which is a
medium speed panchromatic film and Kodak High Speed Infrared which is
a (guess what?) sensitive.

The pictures of living green on the first page (the IR-films are exposed
through a RG 665 filter no filter used with the panchromatic film) are
only showing a weak Wood-effect compaired to Kodak HIE, but the leafs
are brighter compaired to a panchromatic film, I would say the SFX is
exacty between the two films. 


              Ilford SFX 200                Kodak High Speed Infrared

Character     Film with extended red      IR-film for scienctific needs  
              sensitivity

Sensitive     upto 740 nm                 upto 900 nm

Speed         ISO 200/24 (daylight)       approx. ISO 400/27
              ISO 400/27 (tungsten)

Development   11 min in ID 11, 1+1        10 min in ID 11 at 20 C
              at 20 C, agitation 
              every 30 s

Wood-effect   depends on daytime          clearly visable

best filter   RG 665 (Wratten #70)        dark red or IR


The film is grainier as Ilford FP4 but almost grainless compaired to HIE
(no wonder ..), the speed for different filters is (development as above):

filter              daylight              tungsten light

no filter           ISO 200/24            ISO 400/27
Wratten #25         ISO 100/21            ISO 200/24
RG 665              ISO  50/18            ISO 100/21  
 

What else can I squezze out of this article? Hm, most of us know that
HIE is a dog to use, you have to change the film in total darkness, you
have to keep the film cool before exposure and before development, things
you don't have to care than you use Ilford SFX 200. You can use SFX 200
for normal photography with out filter and will only get a bit brighter
reds, for portrais a CC40 filter is recommended (the lips will appair
to bright). 

 
BTW: someone in de.rec.fotografie reported that he used a Wratten #87
     to expose SFX 200, but he had to add 12 stops to get printable
     negatives.


- ------------------------------------------------------------------------
Helmut FAUGEL                       |  Tel.   : +49 / 089 / 3299 2245
Max-Planck-Institut f. Plasmaphysik |  Fax    : +49 / 089 / 3299 2558
Boltzmannstr. 2                     |  E-Mail : faugel@xxxxxxxxxx
D-85748 Garching bei Muenchen       |
Germany                             |
- ------------------------------------------------------------------------


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End of Infrared-Digest V0 #76
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