I'm sure it uses distance info some how but at the same time it doesn't warn you when you choose certain apertures like F16 pointed at something 50 ft away.
--- tom <[EMAIL PROTECTED]> wrote: > On 13 Mar 2002 at 14:54, Peifer, William [OCDUS] > wrote: > > > > I guess the way to test Tom V's idea (about the > possibility that the flash > > intensity is calculated from distance and guide > number information, but not > > controlled by an actual TTL sensor reading) > > I backed away from that...;) > > I'm wondering if distance info is used at all in TTL > flash discharge, and if so, how. > > > is to fire a test shot with and > > without the lens cap in place. If the TTL sensor > doesn't matter, then the flash > > intensities for both of these test shots should be > about the same, and the > > recycle times should be about the same. If the > sensor really ~is~ metering and > > controlling flash output, then the > lens-cap-in-place test shot should have a > > ~much~ longer recycle time. > > The test I have in mind involves testing A vs. FA > lenses (I'm assuming A lenses have no distance > info). > > 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 . > ______________________________________________________________________ Find, Connect, Date! http://personals.yahoo.ca - 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 .
