The quality of a pair of binoculars rests on their crystal clear visibility. Any stain or mark on the surface of a binocular lens tends to scatter light, thereby producing low-contrast viewing. Never wipe dust or dirt off your valuable audubon binoculars using your handkerchief or shirt sleeve. You should always use a professionally made binocular lens cloth to clean them. Whilst traveling, select a binocular which is light weight, compact and fits easily into the suitcase or shoulder bag. A compact roof prism binocular perfectly fits the bill as a travel companion.