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,EXTREME 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 7x50 model, with its broad 7mm exit pupil, is a perfect binocular for boating. This is amongst the rare 7x50 waterproof binoculars which has center focusing as opposed to individual focusing.