I know Arista Premium 100 film is just Kodak Plus X rebranded. By why did they rate the Arista film 100 instead of 125? Also are developing times pretty much the same between the two or are they different because of the film speed difference? Should I rate the film at 125 like its supposed to be, or just 100? I picked up a couple rolls of this stuff, and like to know how to use them.