2008/3/13, Andrew Fildes <afildes@xxxxxxxxxxxxx>:
>
> It's triggered by Wi-Fi from the camera, no? Well, no apparently. I
> checked the manual and while it says 'wireless' it appears to be
> optical -'the built-in flash is used to communicate between the
> camera and the external flashes." The flash has a 'remote sensor'
> which must be pointed towards the E3's built-in flash. But it is
> possible to control three groups of flashes, A, B and C. The word
> 'optical' is never used. Clear as mud.
The difference between radio and light is one of wavelengths. There
are wavelengths which need line of sight without being what we think
of as optical, for example microwaves.
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