Twist-up Eyepieces & Diopter: Three position twist-up eyecups allow the eye relief to be set to ensure a clean, full field of view. The positive dioptre adjuster is simple to set and hold steady even during travel.
Optical Construction: At the very heart of Nature Trek models, BAK4 silver coated prisms produce high levels of light reflectivity. When the fully multi-coated optical lenses are then added into the mix you end up with a bright, high resolution optical system that offer great light transmission properties. The smooth focusing and impressive depth of field ensures no details are lost when viewing at long or short distances. With close focus distance of 2-2.5m, all model are suited to high detail nature viewing.