Nikon's Action Extreme series offer lots of features that will be appreciated by those who enjoy the view provided by classically-styled porro prism units. Following the enormously popular Action series, Nikon has made significant improvements. The group still retains the high-refraction prisms with their wide viewing fields, and every model has a tripod adapter threading for easy extended glassing from a stationary position. The 16x50 Action model has a tripod adapter for easy extended glassing from a stationary position. It is ideally suited to tripod use for fully employing its awesome power, with performance in twilight which is commendable. An ideal binocular for big game hunters.