About the photographic lamp!

It's simple. Ordinary wireless flashlights don't have TTL metering, so the camera can't use the automatic metering function, that is, it must use M file. At the same time, the output light of the flash is also manually adjusted, which can realize accurate exposure.

In addition, the maximum flash synchronization time of many wireless flash lamps and flash lamps is relatively long. If you set a relatively high-speed shutter, you will say half white and half black.