How many exposures do you make of a subject? I work in 4x5, and my habit from the beginning has been to shoot two sheets ( 1 holder) per subject. This lets me vary development, if needed, and/or exposure, if I'm not sure; and is a hedge against physical mistakes in loading/processing. I even find myself doubling up on my rare color negatives, which seems foolish when I review. Of course with a great subject in rapidly changing light, I use more film, but that's not too common. When shooting professionally I'm always balancing between insurance (more exposures)and cost/time (fewer), but there the parameters are different. I realize that the larger the format, the fewer the total numbers of sheets used, but I'd be interested to hear how other people approach this.