... multi-coated, double wheels side adjust, high resolution 20-60X80 spotting scope, ED lens, waterproof, BAK-4 prism, fully multi-coated ... , double wheels side adjust, high resolutionMAGNIFICATION: 20-60xOBJECTIVE DIAMETER(mm): 80 LENS COATING: fully multi-coated FIELD ANGLE: 2.1°-1 ... PUPIL(mm): 4-1.3 EYE-RELIEF: 20-18 ed spotting scopes20-60X80