As you say, the response time of the quench circuit in the flash unit
will be measured in hundreds of microseconds, whereas the speed of
light is orders of magnitude faster (and is thus irrelevant).
That means that there's a minimum flash duration that may still be
giving too much light for the subject (at the selected aperture)
Jez
On 17/05/2012, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
But if you get too close with auto flash control the electronics may
not have enough time
> to respond. Remember one foot to the target and another foot back to
> the TTL flash sensor is only about 2 nanoseconds. I have no idea what
> the minimum distance spec is for the built-in on the E-510.
>
> Chuck Norcutt
>
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