Gskyer Monocular, 20x42 Retro German Technology Monocular, Retro Compact 100%New, Specialized supply monocular for viewing the birds and sceneries. Magnification20X Objective lens42mm(1.65in) Eyepiece20mm(0.8in) Angular Field of View318' 1000m Exit pupil diameter2.7mm (0.1in) Eye-Relief16.5mm(0.65in) Optical coatingFMC Green Zenith MirrorsBAK4 prism Focus All-glass optical components of the monoculars with high transmission coatings for enhanced image brightness and clarity,it is very easy and quick assemble. Gskyer brand has over 20 years history,we have been committed to the pursuit of perfection. 1-year warranty and lifetime maintenance,we will provide the best service and reliable products to our every customer. And best quality at this reasonable price