The Nielsen Company, the owner of leading industry magazine Photo District News and last week's PhotoPlus Expo, has signed an agreement to buy Rangefinder, AfterCapture and the Wedding and Portrait Photographer International trade show. The Nielsen Photo Group will house all of Nielsen’s photo-related properties, which also include PDNedu, the Independent Photography Network, PhotoServe.com and PhotoSource. For the moment, staff of the two magazines and of WPPI, including founder Steve Sheanin, will stay on with Nielsen in current Los Angeles location.