Greg Beetham wrote:I guess you could see if the 1/700sec duration is as claimed for all exposures or does vary according to circumstances. On the A700 you can set whatever ISO you want in M mode (you can't on the A100, it's locked in ISO100), TTL should still work OK in M mode, so what you could do is find some fairly average ambient light like 1/5sec f4.5 ISO200 then take a photo at about 15" with the ring flash but reset the ISO to 1600 or 3200 and the shutter to 1/1000sec (f4.5)...the flash is burning longer than the shutter at 1/700sec so you shouldn't end up with a dark band accross the bottom of the photo..(in theory), although I think there will be one of some sort, whether it's a really black one or a faint one remains to be seen.
If it's a black band then the flash has cycled at much higher than 1/700 sec, if there is a visible smudge then it probably is cycling it 1/700sec....at a guess.
You might have to play with the f-stop if too much ambient gets back into the mix, try f5.6 or f7 etc.
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