Overview and tables 137Overview of standard zoom formatsStandard zoom fixed steps ISOOrigi-nalCopyA0 A1 A2 A3 A4A0 100 71 50 35 25A1 141 100 71 50 35A2 200 141 100 71 50A3 283 200 141 100 71A4 400 283 200 141 100Standard zoom fixed steps, ANSIOrigi-nalCopy34 22 17 11 8 1/ 234 100 65 50 32 2522 100 5017 200 129 100 65 5011 200 1008 1/ 2 400 259 200 129 100Standard zoom fixed steps, ArchitecturalOrigi-nalCopy36 24 18 12 936 100 67 50 33 2524 100 5018 200 133 100 87 5012 200 1009 400 267 200 133 100
