"Compact, durable models ideal for use from the field to the theater. Don't miss a moment. Indoor or out PENTAX quality and clarity are within reach, at a price that's within reach, too. These compact porro-prism models feature a dual-axis, single-body design with synchronized eyepiece adjustment. Aspherical lens elements give you edge-to-edge sharpness. Clear images and clearly affordable. Fully-multi-coated optics ensure maximum light transmission, resulting in high quality viewing. Every surface of every element is fully-coated, minimizing internal glare and flare and giving a bright, clear view. Unique Uni-body design enhances durability by locking objective lenses in a single housing and synchronizing the eyepiece movement. This minimizes moving parts and ensures these binoculars will function properly and clearly for years to come. Aspherical lens elements, which are critical in compact binoculars, provide exceptional edge-to-edge sharpness. This assures that items on the edge of your field of view are just as sharp as those in the center. The UP 8-16x21 Zoom and UP 10x21 and 8x21 models are offered in unique, attractive color options that match your personal style."