Macro the 1/f rule and flash duration

Started Sep 8, 2008 | Discussions thread
jpr2 Forum Pro • Posts: 15,554
Jim: to spare you the search, here it is

JimH wrote:

I have not tried it in ETTL mode, myself yet. But I may. In fact,
that has been requested by a few people

I certainly was among them :), and here is the link:
http://forums.dpreview.com/forums/read.asp?forum=1029&message=26762233

One of the contributors to the FM "macro world" forum has built some
very high-speed LED illuminators. With those, you can precisely
control the flash durations.

could you please post a pointer to this one @FM?

good luck with the ETTL setup, and if you'd ever do it, pls. test also just
a plain, on-board flash of the 40d (with and without diffusers - if
you happen to have one of these, the Puffer would standardize it a bit).

jpr2
--
http://www.flickriver.com/photos/qmusaget/sets/72157600341377106/

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