As the person responsible during the 1950s for establishing Leitz Canada as the center of Leica lens development, Dr. Walter Mandler attained further achievement as developer of the remarkable 180 f3.4 APO Telyt. Featuring glass which corrects chromatic aberrations so well that no focus adjustment is necessary for infra-red photography, its performance is nothing less than outstanding. A small, powerful, high resolution lens that you'll always want to have on call! FEATURES INCLUDE: Built-in, collapsible hood Weighs less than 1.5 lbs