I just received a 400 foot roll of Eastman Plus X 5231 and I have a few questions. First, the can says that daylight exposure is at ISO 64 but the data sheets for Kodak Plus X shows the film speed to be 125. I intend to do some film speed testing for myself but I wonder which speed I should start with? Second, when I develop the film which developer should I be using for best results to start with. The can calls for D-96. Is this similar to D-76? I do have some Kodak HC-110 but I notice that development time for Plus X 125 is very fast using this developer and I suspect I would be better served using a developer that allows a little more time to work. However since Eastman Plus X 5231 seems to be a slightly different animal than Kodak Plus X then the suggested development times may be different. I have not done an exhaustive google search but I did review the quickly available Kodak documents and I checked DigitalTruth's Massive Development chart but I really am no closer to having any clear developing times so any help would be appreciated. Finally (for now anyway) how do you determine the manufacture date or expiration date for cinema films? I have checked all over the can (and my can of Eastman 5222) and have not spotted anything that I would consider to be an expiration date. Is this something that movie makers don't worry about or am I missing something? Thanks for your time.