----- Original Message ----- From: "Frantisek Vlcek" <[EMAIL PROTECTED]> > > How can that be? AF500 FTZ's guide number is lower than 400-T's guide > number, no? The 500 number is inflated for zooming out to 85 (Gosh, is > Metz the only manufacturer who doesn't lie about their flashes guide > number? Or only a little bit? GN is measured for 35mm lens coverage, > that's a "standard". It was always so <g>), while the 400 has the 40 > GN at 28mm or 35mm coverage, no?
Frantisek, According to the manuals you are absolutely right: At ISO 100, with 28mm zoom: AF400T: GN = 40 AF500FTZ: GN = 32 But this just means that both of them are more than powerful enough to illuminate subjects that are,say, 50cm from the lens. When I tested them side by side last summer, I used the 500 at 24mm zoom, and it still burned out the highlights more than did the 400T. Most of the subjects were shot at 1:1 with the Z-1 and a FA100/2.8 macro, with TTL and aperture priority at 1/250 second exposure. There must be something other than GN that cause the 400T to give more correct exposures. I'm not sure what it is... Jostein - 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 .
