Comets Holmes & Tuttle Paul Gaylord Image taken: Dec. 30, 2007 Location: Little Blair Valley, San Diego, Ca. Details: North is down. Canon 10D with Tamron 17-35 mm zoom lens at 17mm. ISO 800, 300 sec exposure. 12 images combined. Cropped to remove the wide ends of the image. Camera mounted an eq mount. ©2013, SpaceWeather.com -- This site is penned daily by Dr. Tony Phillips.