Bikerider
Member
The film I had the most difficulty with was Kodak HIE Infra Red. Nominally 400iso but it was so unpredictable, I always exposed it one full stop either way as well as the indicated exposure.
The time of the year also altered the exposure, in winter there is less IR around so you rated it up to 2 stops slower. High summer with no clouds expose at anything up to 1000-1250iso.
Next in line was Kodak Technical Pan Nominally 25iso Invisible grain with horrendous contrast if over-developed. I used to manage with Rodinal at 1-100 but it was always touch and go.
The time of the year also altered the exposure, in winter there is less IR around so you rated it up to 2 stops slower. High summer with no clouds expose at anything up to 1000-1250iso.
Next in line was Kodak Technical Pan Nominally 25iso Invisible grain with horrendous contrast if over-developed. I used to manage with Rodinal at 1-100 but it was always touch and go.