The 100 mm refractor features excellent multi-coated optics packed into a portable and durable refractor design and comes standard with a 22-66x zoom eyepiece. Youll love it for observing nature and long distance spotting and since it is completely waterproof you can feel comfortable using it in extreme weather. The green rubber optical tube allows for subtle observation in any nature environment. Ultima spotters are a great companion for any nature or outdoor enthusiast. Soft carrying case included. Lens diameter of 100mm. 33. Rubber body. Fold down rubber eye cups. Waterproof. Weight 2112g. Manufacturers limited lifetime guarantee.