I've posted both of these images before. I've re-posted them here together, to show the obvious differences between the tonal range of regular panchromatic film and infrared film.
The first shot is on Kodak Tri-X Pan 320 film. This sheet was rated at box speed of 320 iso and developed for normal contrast in PMK. I ran it on my Jobo processor for 9:35 minutes at 20C. This is a pretty typical panchromatic image.
I shot this on May 26th of 2025 at about 2:00 in the afternoon. I was out on a day trip with my brother in law Shawn and we found this old Pontiac in the brush, just off a gravel road northeast of Edmonton.
I shot this with my Ebony SV45TU view camera and a slightly wide Schneider 110mm lens. No filter was used. The exposure was for 1/60 second at F16.0.
The second shot was obviously taken at the same time and place, with the same equipment. This is a sheet of Kodak HSI-4143 High Speed Infrared film. The film was rated at 100iso. A #25 Red Filter blocked most of the visible light allowing the film to be exposed mostly by infrared wavelengths. I developed this one in Kodak T-Max developer, diluted slightly more than normal to 1:6. Development was with stainless steel film hangers in open tanks. Agitation was minimal, and development was for 6:45 minutes at 24C. No filter factor is needed for infrared film as typical light meters do not register infrared wavelengths. Exposure is somewhat of an educated guess. In this case that was 1/8 second at F22.0.













































