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 that used matrix metering and ambient light.
I've come to this conclusion after proofing dozens of rolls of b+w. 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. I'm not really sure what that implies...I was under the impression that TTL flash metering worked like so: - flash starts to discharge - ttl flash meter measures output - ttl flash meter determines that subject has received enough light - meter tells flash to stop However, if it's using distance info it's just using a calculation. - lens says it's focused at 10 feet - flash guide number is 40 - aperture is f/2 Fire the flash at 1/2 power and don't bother metering. Maybe it (I guess I'm talking pz-1p here) uses that calculation with FA lenses and uses quench metering with older lenses? I might have to test this.... Thinking out loud, tv - 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 .
