shutter speed dji x7 manual

What does DJI mean with this in the instruction manual? Normally you use the 90 degree rule for filming... "Supported Lenses for the Zenmuse X7 The Zenmuse X7 currently supports the following lenses, and will support additional lenses in the future. DJI DL-S 16mm F2.8 ND ASPH DJI DL 24mm F2.8...