Archived posting to the Leica Users Group, 2000/01/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]There are two Tri-X's, and they are indeed different films. One is Tri-X Professional, which is available in 120 and sheet film sizes. Those emulsions are coated on different bases and have different codes: TXP and TXT respectively. They are ISO rated at 320. The other is Tri-X 400. This is ISO rated, obviously, at 400. It is available only in 35mm and 120 sizes, and its code is TX. If you buy 35mm Tri-X, it can only be TX 400; if you buy sheet film Tri-X, it can only be TXT 320; where the confusion comes in is that you can buy EITHER film in 120 size...either TX 400 or TXP 320. They are different films, so, if you shoot 120, watch out that you don't confuse one with the other. ISO rating is done according to a highly exacting process, and does not always equate to the "right" speed you should rate the film. Generally, ISO ratings tend to exaggerate film speed for most uses. All of my comments have been about TX 400. I don't use TXP or TXT. - --Mike