The nitrogen filled rubber armoured housing of the celestron trailseeker 80 spotting scope means that it is fully waterproof and incredibly durable with a zoom up to 60x magnification it has a 80mm objective design that lets in plenty of light whilst also keeping the scope compact and portable the optical system has the proprietary xlt multi coating that produces high resolution images with outstanding contrast and sharpness and the dual focus mechanism allows you to conveniently fine tune