4K HD Wallpaper: Cascades below Watson Falls
Looks very cool as homescreen phone, but of course the 4K image can be set on desktop backgrounds too. The photo was made by Amit Patel and from his courtesy it's available under CC By license.
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x1536 (compatible with almost all tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many smartphones)
Camera: Olympus E-M5 | Lens: 1OLYMPUS M.14-42mm F3.5-5.6 II R | Taken: April 23, 2013
Settings: Aperture: f/13.0 | Exposure time: 1/4 | Focal Length: 17.0 mm | ISO / Flash: 200 / NO