 William Optics BinoViewers Binoviewers greatly enhance your viewing pleasure by allowing you to keep both eyes open which is much more comfortable, especially when viewing for an extended period. Also, using both eyes allows your brain to combine the images from both eyes to mask defects in each one, giving you a better image than you would see with either eye on its own. William Optics' binoviewer comes complete with two 20mm eyepieces so can be used straight from the box. A 1.6x Barlow nose is also included to offer a different magnification and to provide a different optical path length for those circumstances where this is necessary to obtain focus. You can use the binoviewer for astronomy and for terrestrial observation. | 
