Anyone know the reciprocity for this film? It seems to build density fast, my first roll seemed to blast off into orbit. I have a bunch of stuff that is Exp 2008, but treated well and stored cold, so it appears good as new. But I still shot it at EI 50. Was doing some low light landscapes, metered 15 seconds and was like "hmm, better give +2 stops for reciprocity" so went out to a minute, judging by the image dmin (not the base) I'd say for other film I've used, that 4 stops less exposure would be great, but then I'm think it wouldnt be a huge difference on this film since as above it seems to build density quickly. Next roll as also shot at EI50 the next day.. I will pull that roll. Anyone have reciproty, and general exposure recommendations with this film?