ZEISS SFL 50s (SmartFocus Lightweight) represent an outstanding breakthrough in binocular technology. You can now enjoy the optical performance and benefits of a 50 mm objective binocular in a 42 mm frame size.A The Ultra-High-Definition (UHD) Concept ensures true-to-life color reproduction and the highest level of image detail. The 50 mm objective and larger exit pupil, combined with 90% light transmission, provide an appreciably brighter image by allowing 42% more entry light. Thanks to its SmartFocus Concept, the focus wheel is perfectly positioned and enables fast and precise focusing. These premium optics will change the perception as to what an ideal binocular should be in the hunting, nature observation, and birding communities.