INFRA-RED FILMS

Films with enhanced red sensitivity can be used to produce a variety of pleasing effects. In particular, if the effect on the film of red and infra-red radiation is increased by filtration, substantially different tonal values can be achieved. This is most marked with healthy vegetation which reflects a high proportion of infra-red.

One misconception that is sometimes held is that infra-red films achieve their effect by recording infra-red emissions. But by far the most photographically significant source of infra-red is reflection of the suns' rays. Interesting infra-red effects occur because subjects such as vegetation reflect infra-red radiation to a different degree than they do the visible spectrum.

Another misconception sometimes held is that infra-red films are only sensitive to infra-red. In fact they are like normal panchromatic films except that they have extended red sensitivity to longer electromagnetic wavelengths. Stronger or weaker infra-red effects are achieved by using filters to suppress the visible spectrum relative to the infra-red.

The most pronounced effects are achieved by using a filter such as a Wratten 87 or 88, B+W RG665 or equivalent that cut off all visible light. All such filters lower the amount of light reaching the film and this must be compensated for. However photographic meters are not designed for infra-red sensitivity and so exposure is generally a matter of trial and error. Wide bracketing is the best insurance.


Ilford SFX INFRA-RED

High speed, moderately high contrast, infra-red sensitive black and white film with many creative applications. Normally used with either a deep red (Wratten 25) or completely visually opaque (Wratten 87 series) filter. Great care must be taken in using it to prevent fogging, prior to exposure, and during processing. A stainless steel processing tank is recommended.
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Code
Film Type
Net
+VAT
1 645
SFX 135-36
5.99
7.04
---
SFX 135-36 x 10
47.92
56.31
56 147
SFX 135-36 x 3 + FILTER
22.49
26.43
23 661
SFX 120
5.49
6.45
---
SFX 120 x 10
43.92
51.61


Rollei IR820C INFRA-RED

A new infrared film on the market, this is available in all standard formats, and is now the only infrared film available in 120 and sheet formats.

Characteristics:
High speed panchromatic B&W film material with special infrared sensitivity;
Large exposure latitude and a high tolerance to variation in lighting and climatic conditions;
Stable polyester base support ensures highest level of archival stability (LE500);
Excellent resolving power, very fine grain and high sharpness producing negatives of high quality;
Especially suitable for digital scanning;
Special halation effects (Aura effect) by longer exposure times;
Film Base:
accurate, tear proof clear polyester material, 100 microns, 35mm, rollfilm and cut sheet film material.
Film layer:
Emulsion side - protective layer, + emulsion layer + polyester base 100 microns
Base side: NC = non curl coating
Layer thickness: w/o base 7.5 microns
Speed: ISO 400/27°
Grain thickness: RMS (x1000) 11.0 with Agfa Refinal developer, 5 min, 20° C
Resolving power:
contrast - 1000:1 lines/mm - 160

  Rollei Infrared PDF    
     
   

Code
Film Type
Net
+VAT
15 157
Rollei IR820C 135-36 Single
5.83
6.85
47 559
Rollei IR820C 135-36 x 10
58.25
68.44
48 643
Rollei IR820C 135 Test Set (5 x 135-36 + 250ml Dev)
30.00
35.25
48 604
Rollei IR820C 120 Single
5.00
5.88
48 521
Rollei IR820C 120 x 12
62.14
73.01
48 631
Rollei IR820C 135 Test Set (5 x 120 + 250ml Dev)
32.50
38.19
10 592
Rollei IR820C 4 x 5" 25sh
36.92
43.38


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