Happy Sunday--- i need someone to please explain a few things to me. I shot an event last night. There were 7 rooms, all lighted differently. (lit?, what's the proper English there?). I had so much trouble. Shooting with a Canon 5D, 24-70mm 2.8 lens, 580EX flash. What I struggled with is the following: it was terribly dark in there, candle lit with some sconces lit on the wall. Not much overhead lighting AT ALL. I opened my lens as wide as possible (2.8), about a 500 ISO and about 1/40s. That wide, I was having trouble with DoF. If there was a a couple posing for a photo and the guy was even slightly in front of the woman, he was sharp as a tack and she couldn't have been more blurry. Such a slight depth difference...and i couldn't get it right. I played around with a ton of different settings. I did get some great shots, but it wasn't without tremendous efforrt and a lack of understand of what I needed to be at (setting wise). Can you offer up some advice? How do I have enough light without the graininess of a high ISO (I know with the 5D, I can go highER than other cameras, but still...)and without the DoF issues that I was experiencing. The 2.8 was blinking, which was indicating to me that I was doing something wrong....obviously. But I cannot hold the camera still at an 1/8 of a second! I know I asked a lot here, but try your best! Thanks a lot.