>>4039896Showing your retardation yet again, “35mm” comes from film gauge size, the width of film in 135 format was approx 35mm, and it does not refer to the image size. 35mm format also includes half frame, 24x18mm image sizes, and panoramic formats like 65x24mm size. Or motion picture which could be as little as ~22x9.5mm. That is referring to film format, not is a measurement sensor or image size, and is still not perimeter and won’t ever be perimeter. Sensor size is never referred to by perimeter. Again, FF is never called 120mm, MFT never called 60mm etc. Sensor size is always given in two dimensions, or a square measurement, eg 36x24 or 864mm^2.
