Re: Does Canon 30D Pre-fire Speedlight?

geek wrote:
That stinks... I have a bunch of regular slave studio lights... I used
to use my old 430EZ Speedlight stopped down really low to add a
sparkle to the eye and trigger the slaves. Now, this new Speedlight
will trigger the slaves too early!

yep, 'fraid so. The reason is that film cameras used the reflected light from the film surface to decide the exposure, and to quench the flash at the appropriate time. Digital cameras do not give the same reflection from the anti-aliasing filter in front of the sensor, so that method doesn't work. Instead, the regular meter sensor is used, which means the mirror has to be down when the exposure measurement is made, hence the double flash. First flash, mirror down, measurement made, mirror up, exposure with second flash made.

The price of progress sometimes means obsoleting earlier systems. Commiserations.

Colin D.

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