Use this for ratios of 4x5 (4x5, 8x10, 12x15, etc)
Use this for ratios of 5x7 (5x7, 10x14, etc.)
Use this for ratios of 2x3 (2x3, 4x6, 6x9, 8x12, etc)
Use this for ratios of 11x14
Use this for ratios of 3x4 (3x4, 6x8, 12x16, etc)
OD-4 Portraits