D300 built-in flash, Part 1: Blinding speed

Started Dec 25, 2008 | Discussions thread
OP Marianne Oelund Veteran Member • Posts: 7,753
Trigger noise

TOF guy wrote:


  • the initial oscillations: you know it cannot be light measurement

and it is RF noise because the signal goes both positive and negative
(the photodiode response has to be of the constant sign, whether it
is positive or negative, depending on how the diode is connected). Is
this correct? How is the RF noise picked up?

Yes, it's EMI from the high-voltage trigger circuit. I really don't have much choice about picking this up - it radiates all over the place!

  • this is all in manual mode, therefore we do not see a pre-flash. Is

this correct?

That's correct; there is only a single pulse.

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