Stansards are used everywhere. The film formats, or glass plate film formats were most often 9x12 cm ( easily to see with your eye, an an harmonic relation: 3x 4). The 4x5" is near to hat but the harmonic relation is 4x5. This is, I think the basis, and has still most lenses available. The others are related, but still harmonic. the other formats, like the 120 film is not known to me. The 35 mm film is again harmonic , 2x3.