So far I have used it on inland waters, including the Müritz. The image quality is exceptionally good and far exceeds that of my other branded binoculars, regardless of whether it is sunny, dusk or overcast. Class! FOR ME the bag needs improvement. I'm missing a small compartment for an optical cleaning cloth and the lid is too flimsy for me. With sewn-on Velcro on the back and "catching straps" with snap fasteners on the lid, the bag can be attached to the cockpit and the binoculars can be stored within easy reach in the half-open lid. All in all, a top pair of binoculars with very impressive optical quality!