high sync flash (1 Viewer)

I just got a Canon 580 EX2.

The flash give a full flash in 1/60-1/200 mode. (Canon 350Rebel). For faster speeds the flash gives fill in flash provided High Sync is dialed in.

My question is: How do I maintain fill in flash in slower speeds such as 1/125?
Does the flash default back to full power at 1/200 or does it still give fill in flash as long as the High Sync is dialed in?

Peter

Assuming you are leaving the flash in auto ETTL, the flash should only provide 'fill' if you are in aperture priority mode, whatever the shutter-speed. Remember that the faster the shutter speed, the shorter the distance that the flash can 'reach' (because of the shorter flash duration)...so for anything more than about 20 feet away, a flash extender (better beamer) is helpful.

A good source of information on using flash with Canon EOS can be read here...

reply

Tx a lot for your reply. I usually set the camera on TV priority. I assume it works the same as for Av priority?

I appreciate your reply.

Peter

Yes it does Peter. In AV and TV modes, the camera tries to expose the background correctly and only uses the flash to light the subject.

You can therefore use your camera to adjust both the background exposure using normal exposure compensation and the subject exposure using the flash compensation.