Response to Exposing Tri X and Normal Development Times

There is no such thing as over or under exposure. There is correct exposure which places the shadows where you want them. Then there is plus and minus development to place the highlights where you want them. What you are refering to i believe is what film speed you should use. This is determined by a number of things , such as 1. your paper 2. your type of enlarger 3. your camera and meter. I am taking forgranted that you are using a roll film camera. Expose your film in this manor using tri-x ... first frame no exposure second frame four stops under exposed at iso 200 and repeat this exposure sequince at iso 250, then again at iso 320 and 400. Then print an unexposed neg. till you just get a full black an the paper you use, and with the enlarger you will most often use. then print the exposed frames with out changing anything, and wich ever one of these negs. gives you the first noticable change in gradation will be the correct iso for you. Dan

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