Guys and Gals. I am thoroughly disgusted. I am not an expert by any stretch in fact I have relied on auto settings (both flash and camera) for most of my weddings but I cannot get my system to stop underexposing my shots particularly reception shots. I am also not a newbie, I have shot wedding for 17 years. I have had a constant problem with by flash exposure since switching to digital 5 years ago. It happened with my 20D, 1d MKII, and now the 1DS MKIII. I have gone through 420, 580ex, and now 580EXII. I shoot the 1dsMKIII in P and set the 580II on ETTL with the Lightsphere clear and a newton bracket. these shots were FEC +2/3 using the Quantum Turbo battery. WHAT AM I DOING WRONG!?!?!? This is ridiculous. These shots are terrible.
ISO 1000 F2.8 42mm. I was only 10 feet away.
iso 1000 f 4.5 42mm 10 feet away.