4K HD Wallpaper: Dry Tree with the City Lights in Background

The 4K picture picture was taken by Kevin and from his courtesy can be saved free for personal use as desktop backgrounds and lock screen phones.

Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with almost all tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many smartphones)

EXIF Metadata:
Camera: Canon EOS 6D | Lens: EF50mm f/1.4 USM | Taken: April 15, 2014
Settings: Aperture: f/2.0 | Exposure time: 5s | Focal Length: 50 mm | ISO / Flash: 100 / NO

Photographer: Kevin Dinkel from Pasadena, CA, USA | Flickr Portfolio
License: Creative Commons Attribution-NonCommercial-NoDerivs 2.0 Generic
Kevin, thank you for your courtesy!