Efke AURA IR820 4 x 5" Black and White Infrared Film is a medium speed infrared film with the same configuration as Maco IR820C film. It is available in several formats up to 4x5" and it features a spectral sensitivity of 820nm.
If you use this film with a dark or opaque red filter, you'll find your foliage and clouds go pure white while sky and water will be deep black. The lack of the anti-halation backing will create a halo around your highlights.
Note:
Testing of this brand new emulsion has shown that best results are obtained by exposing the film at ISO 25 and using an infrared filter such as a Hoya R72, Tiffen #87 or B+W 092. (Standard Red 25A filters are not recommended).
Skin tone (warm) and lips reproduce as white
Near-infrared results are obtained by exposing the film at ISO 25 with a Red 25A filter. Aperture f/16 Shutter speed 1/30th second
Use for pictorial applications, such as architecture, landscape, portraiture