Yesterday evening I went to Nantes in order to try out some infra-red pinhole with the 4×5 pinhole camera. The film used here is Rollei IR400, and the filter used is the Hoya R72.
Thank you Jacob Klee for finding and sharing the perfect ASA (with the R72 filter) and reciprocity characteristics for this film….which are as follows:
Note: I was using the ‘Pinhole assist’ app on the iphone to meter and the “Reciprocity+” app to compensate the metered time.
1: Meter at ASA3 (using pinhole assist app with the applicable “f number” set),
2. Enter metered time into “Reciprocity+” app using the “Tri-x – plus x125” reciprocity setting (which I copied and renamed Rollei IR400).
This exposure ( of the beautiful Lu tower in Nantes) was 5 minutes..