The guide number is limited by the energy stored in the capacitors and
the width of field illuminated. If two heads are sharing the same
energy it seems reasonable that the guide no. would go down ...
-jeff
On 7/19/07, usher99@xxxxxxx <usher99@xxxxxxx> wrote:
>
> Piers,
> Thanks again for these.?
>
> Weird that on the Alan Wood site in one place near where he mentions the
> calculator panels (T28), the? GN with one flash is listed as 22 and 28 with 2
> heads.? It is the opposite later on his site and anywhere else, including on
> your panel pdf.?? Must be a mistake on the AW site.? I don't know how the GN
> would go down with 2 heads (must be the case), unless the controller T power
> control attenuates the power to both.? Perhaps there is something weird about
> GN's at macro distances.? Manual macro flash shouldn't be as weird as quantum
> effects, though Heisenberg seems to lurk over my shoulder when I try it.
>
> http://www.alanwood.net/photography/olympus/t28-macro-twin-flash.html
>
> Mike
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