I shoot 4X5 80% of the time with 8X10 the balance. I want to build a 10X16 format camera. I think that it would make a wonderful format since it has the same aspect ratio as a 12X20. This is very near the aspect ratio of the "Golden Mean". Film can be had from Bergger as well as others. 20X24 Azo could be cut down to two sheets and a couple of 8X10 pieces left over. Film holders have been arranged, so it is just deciding if I want to commit the time and energy to this.