7x50 Steiners or 8x30 with a little less magnification and shorter field of veiw 8 is the magnification 30 is how wide field of veiw. The 7x50 are larger and the highest magnification the Navy will issue on a small ship or boat any bigger they need a tripod. The Steiners have a boro prism vs a roof prism meaning once you focuses them they are always in focuss as you scan the water etc. you can find much cheaper glasses but at night the better German lenses will allow far more light transmission thus you can see much better ie: the distant nun buoy or the birds far off.