David Hobby produced a series of DVDs called Lighting in Layers that explains how to use small battery powered speed lights to produce amazing lighting effects. The videos show subtle lighting and dramatic lighting, with and without modifiers. There is lots of discussion on how shutter speed and aperture can be used to mix ambient light and speedlites.
The videos are well worth the cost if you are interested in learning the art of off-camera flash.
I’m frequently amazed by the way some photographers can make such a difficult shot appear to be simple. When I first saw this behind the scenes video of Joe McNally getting the environmental portrait of a guy changing a light bulb on the top of the TV antenna at the top of the Empire State Building, I thought it was such a simple idea. It all looks easy but took three attempts on different days and a really novel idea from Joe on how to get the camera above the light. Plus he is WAY up on top of one of the tallest structures in the world. The picture was for a story that Joe was working on for National Geographic called the Power of Light.
Zack is famous for his OneLight portraits. I read about Zack in someone’s blog a long time ago and followed his blog for quite a while.
In this video from Creative Live, Zack discusses the relationship between flash power and aperture.
Zack and Creative Live have produced a series of videos that can be purchased based on his 3 day workshop. Almost like being there, but you get the added flexibility to repeat any portion of the workshop that you didn’t quite catch, or that you are having difficulty grasping.