In a long-awaited event livestreamed worldwide, Nikon Corp. unveiled its first full-frame mirrorless camera system Thursday, finally entering a segment that is still growing despite the explosive proliferation of camera-equipped smartphones.

Nikon's Z7 weighs only 675 grams and is equipped with a 45.75 million-pixel sensor and 493 auto-focus points on its electronic viewfinder screen. The camera also boasts a much smaller body and larger lens mount than those of Nikon's traditional F lens mount, part of its single-lens reflex cameras.

The Z system, with its larger lens mount, will allow the company to develop "a new dimension in optical performance," Nikon President and Representative Director Kazuo Ushida said at a news conference in Tokyo.