This week Mark talks about the difference between an umbrella and a softbox. Learn how your light modifier is affected by size, shape and control.

AdoramaTV Presents Digital Photography One on One. In this episode Mark Wallace demonstrates the use of grids in the studio. Mark shows you how grids help to restrict the light falling on the subject.

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Send your questions to: AskMark@Adorama.com

This project was created with the same spirit that america was founded on. Our intentions are to connect everyone in america through the lens of this camera and social networking sites. We can't do this without you. We want to tell your story and show your city or town through photographs of you, and people you know. As we travel around america looking for people and places to shoot you will be able to keep track of where we are going and help us decide where we go next. Join us in our journey by liking our facebook to get yourself photographed by us.

An extra special thanks to Brandon Rein, Scotty Hoffman and Trevor Atwater.

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In this episode of reDefine, we sit down with commercial photographer and video creator, Mark Wallace. He walks us through the pretty fascinating road he took to build his career, including years of producing morality plays, several hospitalizations due to flat-out exhaustion, and all kinds of awesome-to-see hairstyles. And, faced with the flash round, Mark opens up about his favorite gear and his technical pet peeves.

Grover of PhotoShelter interviews John Harrington, author of the book "Best Business Practices for Photographers," about setting a fair and effective pricing system.