Ahead of our full review, here are some sample images taken with the new Asus Zenfone 4 smartphone. The Asus Zenfone 4 is a 5.5-inch mid-range smartphone accompanied by the strap-line "We Love Photo". It has a dual-lens camera with optical image stabilization, with a large F1.8 aperture main lens and a 120° / 12mm wide-angle secondary lens, ultrafast 0.03 seconds phase-detection and subject-tracking auto-focus, plus 4K UHD video recording.