On Dec 20, 2004, at 6:11 PM, Kostas Kavoussanakis wrote:
It depends... For instance TTL in modern Minolta's used 4-segment sensor. All TTL-aware Pentax cameras use CW type of TTL sensor though. All "plain" flash TTL sensors are completely independent from continuos (available) light matrix metering ones.Is there such a thing as Matrix Metering when it comes to TTL? Isn't TTL a completely different thing that happens OTF and with a different sensor (or set thereof)? Or does it share the the algorithms with "conventional" metering?
One shared sensor for flash and available light metering is used in case of modern pre-flash metering type units working in P-TTL (or ADI, E-TTL, i-TTL at other producers). These modern systems use pre-flash and meter light distribution using the same sensor like for available light. Then mirror is raised and exposure done. The one exception was 3D matrix balanced TTL used by Nikon. It did pre-flash but metering was done right after mirror was raised. Here 5-segment dedicated for flash sensor was used. This sensor was getting light reflected from grey painted shutter curtain.
Apologies if this has been done to death,
Watch out, or you will be banned forever :-P
;-)
-- Best regards Sylwek
