Question: what is 2r photo size?
Answer: All Photography Series Paper Sizes Passport 35 × 45 mm 2R 64 × 89 mm LD, DSC 89 × 119 mm 3R, L 89 × 127 mm LW 89 × 133 mm KGD 102 × 136 mm 4R, KG 102 × 152 mm 2LD, DSCW 127 × 169 mm 5R, 2L 127 × 178 mm 2LW 127 × 190 mm 6R 152 × 203 mm 8R, 6P 203 × 254 mm S8R, 6PW 203 × 305 mm 11R 279 × 356 mm A3+ Super B 330 × 483 mm.