Thoughts on Trailing Curtain Sync

Godfrey DiGiorgi gdigiorgi at
Sat Jul 3 11:08:16 EDT 2010

On Sat, Jul 3, 2010 at 1:56 AM, Bob W <pdml at> wrote:
>> All my FourThirds and Micro-FourThirds bodies allow me to enable
>> second curtain sync any time I want, with any flash. IIRC, both my
>> Sony R1 and my Canon 10D allowed the same.
>> The algorithm is very simple: the flash is triggered about 300ms
>> before the second curtain is released. So it obviously works best with
>> exposure times of a half second or longer, but then that's when I'd
>> use second curtain sync anyway.
> I've found it most effective for my taste at 1/15th second, generally when
> there's already quite a lot of ambient light in the scene. These pictures
> from midsummer a few years ago are my most successful and (I think)
> effective efforts, shot at 1/15th. All shot with an Oly E-1 and Oly flash of
> some sort.
> Start here, and click through about 8 snaps:
> <>

Thanks for the photos ... good stuff!

The trigger lead time is shorter than I wrote. A 125 second flash burn
is 8 ms and that's a long burn; they probably do trigger with 30 ms
lead, not 300. :-)


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