These are waterproof, Military spec binoculars. They are extremely strong and well built and deliver clear, wide field views that are much sharper than many competituve units. From the BAK-4 fully multi-coated prisms to the individual eyepiece focus that allows the user to precisely focus for each eye, these are the best 10X50's for astronomy we have found to date. The interpupillary distance varies from 57 - 74 mm. The field of view is 341.3 ft at 1000 yards providing a 6.5 degree field of view (13 full moons!)
The eyepieces are very sharp and have large eyelenses. The eye relief is 18 mm. The near focus is 35 feet.
These military spec binoculars are not made of plastic as are many. The rugged aluminum body weighs 3.4 pounds which is entirely manageable. Each set comes with covers, a hard carrying case, case strp and neck strap.