The first method is to name the serial number (or folder code) based on the file of the photo taken, but this method has a disadvantage, the count can only be within 9999, and it will be reset and recalculated if it exceeds 10000 times.

The second is software judgment. For example, the photo editing software of the light and shadow magician can check the shutter times, and the shutter times are still very accurate.