I don't know about flash in general, but I know the pre-flash with
Nikon equipment is not performing the same task as TTL metering. It is
being used to balance flash output with ambient light. It is measuring
the light twice, once before the pre-flash and once during, then
making a flash output calculation to balance the two. It works pretty
well in my opinion, but I am an idiot when it comes to flash.
Winsor
Long Beach, California, USA
On / March 25, 2008 CE, at 8:20 PM, Curt & Sally Hedman wrote:
> Do the Olympus DSLRs provide true TTL flash metering, or do they
> resort to a pre-flash system like N*k*n's iTTL, C*n*n's E-TTL, and
> P*nt*x's P-TTL? I believe that early P*nt*x DSLRs used true TTL flash
> exposure control, but the current lines have gone to the pre-flash
> technique... as I understand it, the problem with true TTL flash
> metering with digital SLRs is the specular reflectivity of the imager
> and it's protective filters, or so say the pre-flash proponents. Just
> curious what position Olympus has taken, particularly in the E-3.
> I've browsed the E-3 manual and find no mention of anything except
> good old TTL flash metering, but I figure the gurus on this list are
> "in the know"! Thanks!
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