In order to hopefully save myself some time and money, I have a question that I hope someone might have the answers to. I own an 8x10 and 4x5 camera. I have been doing a lot of shooting with the 8x10, and very little with the 4x5. But, I have started to do some portraits, full body ones, with the 8x10 and 160Nc film. With the limited depth of field inherent with the 8x10 and the slow film speed, I feel like I need to jump up to 400NC film to get what I want. So, that got me thinking as to how big the difference is between a 4x5 shot on 160Nc film and an 8x10 shot on 400Nc film. Is there any point in shooting 8x10 with 400Nc film when I can shoot 4x5 with 160Nc. I am planning on printing sizes as large as 32x40 and 40x50 inches. I know the best way to find out is to try it myself, but I have never shot 400NC film and don't want to buy a box of 8x10 unless I know I am going to use it. Basically, how does the larger film size of the 8x10 combined with the higher film speed compare to the smaller film size of the 4x5 combined with the slower film speed. Are there noticeable differences in grain and such. At what size do they occur? Thanks everyone.