To the best of my knowledge Moose is correct. I am not aware of any
digital camera that implements TTL-OTS (let's call it "off the sensor"
since there's no film) They all work by pre-flash measurement or a
combination of pre-flash measurement along with feedback from the lens
on the focusing distance to the subject if the lens is capable of that.
Canon has struggled for years to try to get this right but haven't
been 100% successful. I'm not aware of how the other brands are doing
except that I think they may be doing better but not perfect. The OM
TTL-OTF for flash probably worked as well or better than anything else
available today.
Dr. Flash
Moose wrote:
> 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.
> I'm not aware of anybody implementing TTL-OTF on a DSLR, although I
> don't know everything, for exactly the reason you give.
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