"It's not so much the camera but knowing how to use it," he says. "I understand what settings to use. I understand how light works and balance ambient light with supplemental flash to get a good exposure. And I understand basic composition for interiors, the cardinal rule being: keep your verticals vertical!"

He also tries to show how every room relates to the ones around it. "Does the bedroom have a private bathroom? Does the kitchen lead to a patio? Where is the dining area in relation to the kitchen?" he says.