The entire optical system of the Vanguard VEO XF 8x42 is coated with a broadband green film to increase the brightness of the image and make it easier to operate. The so-called broadband green film refers to the brightness that can be increased by the coated film. It can increase the brightness in a range of 320NM-680NM. Instead of only increasing the brightness in a certain range.3-stage rotatable eyecupsIn order to achieve a better exit pupil distance for different users, a three-stage adjustable eyecup has been developed, which can be increased by 3mm or 6 mm by rotating the eyecup counterclockwise.Fully waterproof and fog-proof:- Waterproof to 1 meter and fog-proof- Excellent for outdoor use, even on rainy days.Ergonomic thumb position:- Vanguard uses stylish streamline shapes to ensure better aesthetics and ergonomic thumb position.Large eyepiece:- Wide viewing angle, comfortable observationModel: V251455