I use PCB Einsteins with Carestream half-speed blue in the studio. I rate the film ISO 25 under those conditions. But bear in mind I'm using a Packard shutter — so I'm not sure how accurate the nominal 1/25th second exposure is. I suppose I could put a modern lens with a Copal shutter on my camera & do some tests. If I do I'll let you know the results.
Bookmarks