BOlympus Tracker 10x25 Porro Prism Compact & Lightweight Binocular ReviewbP PP Olympus Tracker 10x25 Porro Prism Compact & Lightweight Binocular P10x magnification and 25mm objective lensPField of view: 91 meters (at 1,000 yards)PHigh-index prisms for a bright, crisp imagePCompact and lightweight for portabilityPTwisting eyecups for personal comfort; central focus knob and dioptric correctionP