Correct me if I’m wrong, but I think if you use the “35mm equivalent” focal length from your camera’s specs you should leave the sensor size at 36mm.
I believe that you should only set the sensor size to match the camera’s specs if you use the actual focal length. Source: https://blender.stackexchange.com/questions/26256/relationship-between-the-sensor-size-and-focal-length and experimentation with Blender camera settings.
