[leicapfile]

Peyton,

If you are referring to a TTL flash capability analagus to that of a film camera ((where a sensor mounted inside the camera reads the amount of light reflected off the film (OTF) to determine correct flash duration)), that does not happen with any digital camera/flash combination. The digital sensor does not reflect the incoming light to be read.

Now it may be a question of terminology definition, in that by whatever device, the light of the flash is, in fact, captured and read as it passes through the lens (thereby adjusting the flash pulse for proper exposure).

However it doesn't do so utilizing the actual digital sensor that captures the end image as TTL does with film. As confirmed by me in a series of e-mails with Leica and Metz in discussions surrounding my M7 and D2, using both a 54 MZ3 with M4 hot shoe adaptor and Leica SF24D, TTL is the proper setting on the Metz with the M7. TTL/GNC is the proper setting for the M7 with the SF24D. In this case the 24D senses it is mounted on the M7 and utilizes the cameras TTL capability.

Regarding the D2, one sets the Metz at A (automatic) reading through the external sensor mounted on the flash. With the SF24D, one sets it on TTL/GNC, wherein it communicates with the body, both using their GNC (Guide Number Control) circuitry.

I'd appreciate any camera/flash web site where true TTL is touted as a capability where the flash reads reflections off the digital sensor to calulate pulse/exposure time as happens with film. To date I, Leica and Metz are unaware of any.

Thanks,

Jerry