I have been a proffesional photographer for 18 years. I shoot tons of B&W film and still do all my own processing by hand. i have found that your exposure depends a little on how you process. My personal findings are: tri x 120 or tri x 35mm should be shot at about 320 ISO and tmax100 120 or 35mm should be shot at an ISO of 80. These both open up the shadows a little and still gives wonderful blacks.(posted 9400 days ago)I am a B&W lover and I think you should try a few combinations of exposures and processing procedures until you find a gray scale and density you like.....