Wow, those are some long exposures!
Most of my Rollei IR400 shots are done on a 35mm rangefinder, exposures between 1/3s and 1/25s, and mostly handheld.
I can get shorter shutter speeds with the red 29 filter, of course, which makes it much easier to shoot on-the-fly, and the IR effect looks almost the same on this emulsion.
Yeah, cloudy and f/22 got me there pretty quick. No idea about reciprocity on this emulsion either.
I have a 100' roll of this to use in 35mm. Wanted to shoot it in my Widelux but I've gotta get the 1/15 exposures working better first (with red filter only, don't have an R72 and have no idea what to do on that front).
Or I could chuck it in my Pentax 67 with 35mm adapters...
If you use the Reciprocity app, it has data on Rollei IR400.
Using a rangefinder camera is great. Mine has AE and AF, so I set the ASA to 200, and shoot with the IR72 filter attached.
I love IR film. I also use a a 720, but might try something farther to the right.
Ilford Classic FB Glossy 24×30, Rollei infrared 400 35mm, Nikon Fe, IR72 filter, 6 iso
In 35mm format the film has the normal thickness as any others. In 4x5" (as many of us has already noted) is very thin (too much for my taste).
here in MF (120). Quite "normal" in thickness
Mamiya rz67 pro2, Rollei infrared 400 (format 120), ID11 1+1, IR72 filter, 6 iso
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