Dunno, but I just took delivery of a Nikon Monarch 5 8 x 56 bino and it is outstanding. Very pleased with every aspect of the glass. Order one of each from Amazon and then return the one you don't like. (They have a liberal return policy). The Monarch 5 has ED glass, dialectric prisms, is fully multi-coated and nitrogen purged. Have you looked at the Doctor Optic binos? They are also outstanding. They have a 10 x 42, 8 x 42 and 5 x 56 with ED glass that are very, very good. The 8 x 56 has Abbe Koenig prisms.
Jordan