Digital mirrorless cameras with interchangeable lenses grabbed the spotlight Thursday at CP+2012 as the nation's biggest international camera and imaging show opened in Yokohama.

The concept is camera makers' latest cash cow, and competition is expected to heat up as this uncultivated market develops. The show at Pacifico runs through Sunday.

Mirrorless interchangeable-lens cameras, which debuted in 2008, are as small as compact cameras but more capable of shooting quality photos on a par with single-lens reflex cameras.