Wallpaper – Tubes by Jason Prahl | Jan 25, 2012 | Blog, Wallpaper Click image for 1920 x 1080 version. You may use this image for personal use only. Please contact me for business use. Camera: NIKON D7000 Taken: 1 November, 2011 Aperture: ƒ/3.8 Focal length: 21mm ISO: 200 Shutter speed: 1/40s