It’s not that the lights aren’t fast enough it’s that above a certain speed your shutter isn’t fully open at one moment, instead it’s a slit travelling across.
The reason your speed light works is because in hss mode it rapidly flashes, effectively creating a constant light during the exposure.
Source: 23 years working at a place called ‘The Flash Centre’
I know what it is. The lights aren’t fast enough to sync with the shutter speed.
The same doesn’t happen with a speedlight
It’s not that the lights aren’t fast enough it’s that above a certain speed your shutter isn’t fully open at one moment, instead it’s a slit travelling across. The reason your speed light works is because in hss mode it rapidly flashes, effectively creating a constant light during the exposure. Source: 23 years working at a place called ‘The Flash Centre’