Choosing a bga monocular guarantees you one of the best field monoculars available on the market today the combination of a large objective lens high quality morita roof prism plus a long eyerelief eyepiece means that unlike smaller monoculars a bga monocular provides viewing performance akin to a pair of average size roof prism binoculars in a pocket size instrument measuring only 43mm x 136mm with fully specified multicoated internally focused optics and the added assurance of nitrogen wat