Kodak's High-Speed Infrared film reached further into the infrared spectrum than any other commercially available film. Its lack of an antihalation layer allowed strong light to pass through the film during exposure, hit the camera's pressure plate, and pass back through the film, resulting in a "halo" effect. Another characteristic was the apparent grain, which allowed for an ethereal effect.
Konica's version of infrared film did not reach nearly as far into the infrared spectrum as Kodak's film, and its antihalation layer did not offer the halo in strongly lit areas. However, its slower speed gave the film a considerably finer grain and filled a need when the ethereal effect was not considered appropriate for the scene. I used this film in the 120 size, so the sharpness of the scene was enhanced. Some of these images were created within a pinhole camera, which allowed the film to work in an alternative direction.
Other Websites You May Enjoy
Sounds Of Ambience
One Minute How-To
DRiP Investing Resource Center