From: mike wilson
mike wilson wrote:
> John Sessoms wrote:
>
>> The K-10D and K-20D both allow you to set the on-board flash to
>> trailing curtain sync. How difficult would it be for them to make the
>> hot-shoe also fire on the trailing curtain when a non-dedicated
>> "flash" is installed?
>>
>> E.G. like with a radio-sync transmitter or Vivitar 285HV? Dedicated
>> flash like the AF-540FGZ has its own circuitry to talk to the camera
>> and can be set to trailing curtain sync.
>>
>> Is this something they could do with a firmware update?
>
>
> Non-dedicated flashes fire when they are told to. It doesn't mstter
> whether that is at the beginning, the end or halfway through exposure.
> On the face of it, some coding telling the camera to fire any connected
> flash at the end of exposure would be a comparatively simple task. So
> simple that I must go and see if it will work already....
OK. With KX and AF280T, it's no go. Trailing curtain seems to be a
PTTL-only mode, as the RTF preflashes. Some illogicality there......
There is no trailing curtain mode on the DL2.
>
The non-dedicated flash fires when the main hot-shoe contact triggers.
I'm asking how the camera controls when that main hot-shoe contact
triggers. Could a camera software change make it trigger the main
hot-shoe/PC contact on the trailing curtain when the on-board flash is
set to trailing curtain? Or would it require physical changes to the
wiring inside the camera?
The K10 and the K20 allow you to set the on-board flash to
trailing-curtain. The AF-500 (which worked with the *ist-D) and the
AF-540FGZ have trailing curtain sync built into the flash.
On the K10 and the K20, with the on-board flash set to trailing curtain,
the main hot-shoe pin triggers on the front curtain. Same for the K20's
PC sync.
Is this main pin trigger on front curtain hard-wired into the camera, or
is this something that could be changed by a firm-ware update?
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