The Burn After Reading star - whose pictures of partner Angelina Jolie breastfeeding one of their twins feature in the upcoming issue of W magazine - can't put his camera down, revealed Angelina.
She said: "I love his photography. Some people have a hobby and they find the quickest way into it and are very pleased with the outcome right away. "But he's someone who will really study the camera. He'll get the most complicated one and really understand the science behind it."
The Wanted actress also says Brad strives to make his photographs perfect and is rarely completely happy with his work.
She added: "He's very critical of his work. I'll see a photograph and think it's amazing but he'll see all the different reasons why it can be better and he'll work very, very hard to improve it."
Brad, 44, recently revealed there will be nothing as important to him as Angelina and their six children, Maddox, seven, Pax, four, Zahara, three, Shiloh, two, and two-month-old twins Knox Leon and Vivienne Marcheline. He said: "My family comes before everything else. No film will ever take precedence or fill me with the kind of joy I have as a father and partner."