There seems to be several different temperature markings on film, and I am curious as to all their meanings. For the sake of example, I am looking at information on Ilford HP5 Plus film. My first question is in reguards to the temperature listed with the film speed, in this case it is shown as ISO 400/27. I assume that the 27 is Celcius. What does this 27 signify? Next I'm curious about EI ratings (found in specifications pdf file obtained from Ilford's website). How are these different from the ISO number and why are there different temperature ratings listed, such as EI 3200/36? Finally I see another temperature listed on the box the film came in along side a picture of a thermometer, that indicates 24C/75F. Is this the temperature to store the film at?(posted 8860 days ago)One more that may have been asked before... I know that film stored in a hot environment can fog the film... should I worry about storing the film in too cold of a place? Is a refridgerator that keeps a temperature of 38F too cold for the film?
I appreciate any help on these ongoing mysteries. Thanks.