John, This is a real issue for wedding shooters and anyone doing location/outdoor portraiture (or any other sort of mixed daylight/flash work, which Paul obviously does). Flash sync does matter and Pentax continues to offer the only camera in-class with a sub-1/250 sync (the 40D/50D, D300, E-3 and A700 all offer the better sync speed).
-Adam On Thu, May 21, 2009 at 11:43 PM, John Poirier <[email protected]> wrote: > This is catastrophic! My retirement plans were entirley based on selling > backlit protraits of hummingbirds to microstock agencies!!! I've really > had it with Pentax. There are lots of real pro systems that will give you > perfect shots of everything at the push of a button, and I'm gonna get me > one real soon. Right now I'm kinda busy fixing the light leaks in my Zenit > E.. > > ---- Original Message ----- From: "Paul Stenquist" <[email protected]> > To: "Pentax-Discuss Mail List" <[email protected]> > Sent: Thursday, May 21, 2009 8:09 PM > Subject: Re: Oh another K-7 thread... > > >> You're missing the fact that the amount of flash exposure you can work >> into a shot is dependent only on the f stop. So if I shoot a backlit >> portrait outdoors at f5.6, 1.250th, I can fill flash in at that 5.6 value. >> If I'm forced to stop down to f6.7 because I can't go beyond 1/180th in >> shutter speed, I lose flash exposure and increase DOF. Ideally, I'd like to >> have flash synch up to 1/1000th, but that's complex and cost;y. And >> high-speed synch doesn't help much, because the flash power is greatly >> diminished by multiple firings. >> Paul >>> >>> Of course, with hummingbirds, it's even worse. Why, at 1/180th, the >>> hummingbird's wings have gone through a whole 38% of a stroke. With >>> 1/250th, >>> that'd be reduced to a mere 28%. >>> > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
