tom, I was thinking that it had more to do with getting more even light do to flash fill moreso than TTL alone. On the older bodies, metering for TTL did not include ambient light at all, so most images ended up looking like dark backgrounds. With later bodies, ambient light is taken into account and shutter speeds are lowered to slowest handholding to allow as much ambient light as possible. Then the TTL is just going to fill in where necessary. That would produce more even results.
Have you tried using slow films/fastest shutter speeds (1/250)? If you did I would think that you would get results that would show the inherent TTL metering problem of weddings - mostly white in frame - face gets underexposed - mostly black in the frame - face gets overexposed. I have often wondered what the metering pattern is for the TTL sensor - I'm guessing it is center-weighted. That could also account for some differences. Bruce Dayton Wednesday, March 13, 2002, 10:08:56 AM, you wrote: t> I've noticed over the course of the last year that rolls of film that were shot with TTL flash metering (and flash) have much more consistent exposure across frames than rolls t> that used matrix metering and ambient light. t> I've come to this conclusion after proofing dozens of rolls of b+w. t> Seems to me the only way to explain the difference is that the flash output is determined by distance info transmitted by an FA lens. t> I'm not really sure what that implies...I was under the impression that TTL flash metering worked like so: t> - flash starts to discharge t> - ttl flash meter measures output t> - ttl flash meter determines that subject has received enough light t> - meter tells flash to stop t> However, if it's using distance info it's just using a calculation. t> - lens says it's focused at 10 feet t> - flash guide number is 40 t> - aperture is f/2 t> Fire the flash at 1/2 power and don't bother metering. t> Maybe it (I guess I'm talking pz-1p here) uses that calculation with FA lenses and uses quench metering with older lenses? t> I might have to test this.... t> Thinking out loud, t> tv t> - t> This message is from the Pentax-Discuss Mail List. To unsubscribe, t> go to http://www.pdml.net and follow the directions. Don't forget to t> visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
