Had it a few days. Viewing more than 3 miles across Biscayne Bay during night and day, I can't make out faces on the other side, but I can see cars, street signs, people walking around, activity in bayside cafe's, birds; etc.. Wow! The large 100 mm (almost 4) front end and 28.5mm (1.1) eyepiece lenses are so bright and clear that at night the streetlights are more than enough. The tripod is awful and this is a big heavy piece of glass. If you must use it, I suggest that if you zoom into 90 x 's magnification you should center your mark, focus, and don't touch the scope at all while you viewing because it bounces more than the choppy water I was looking at! A stable base is absolutely necessary at high magnification! Spend for a solid base and a gimbal pivot system which holds the scope stable and let's you aim up/down side to side and zoom in/out smoothly in real-time while viewing to catch action without shaking.You know the scopes in tourist areas that cost a quarter to use at the top of the Empire State Building, Freedom Tower, Niagra, Eiffel Tower, etc.; this thing is way better!A great deal for the price.