▁have ▁anti - reflect ive ▁multi - layer ▁coat ings . ▁ ▁fully ▁multi - co ated : ▁all ▁air - to - glass ▁surfaces ▁are ▁anti - reflect ive ▁multi - layer ▁co ated . ▁ ▁For ▁bin oc ular s ▁with ▁roof ▁pr isms ▁only ▁( not ▁needed ▁for ▁Por ro ▁pr isms ) ▁▁ ▁phase - co ated ▁or ▁P - co ating : ▁the ▁roof ▁pr ism ▁has ▁a ▁phase - correct ing ▁co ating ▁ ▁al umin ium - co ated : ▁the ▁roof ▁pr ism ▁mirror s ▁are ▁co ated ▁with ▁an ▁al umin ium ▁co ating ▁( the ▁default ▁if ▁a ▁mirror ▁co ating ▁isn ' t ▁mentioned ). ▁ ▁silver - co ated : ▁the ▁roof ▁pr ism ▁mirror s ▁are ▁co ated ▁with ▁a ▁silver ▁co ating ▁ ▁die lect ric - co ated : ▁the ▁roof ▁pr ism ▁mirror s ▁are ▁co ated ▁with ▁a ▁die lect ric ▁co ating ▁ ▁App lications ▁ ▁General ▁use ▁▁ ▁Hand - h eld ▁bin oc ular s ▁range ▁from ▁small ▁ 3   ×   1 0 ▁Gal ile an ▁opera ▁glass es , ▁used ▁in ▁the aters , ▁to ▁glass es ▁with ▁ 7 ▁to ▁ 1 2 ▁times ▁magn ification ▁and ▁ 3 0 ▁to ▁ 5 0   mm ▁diameter ▁object ives ▁for ▁typical ▁out door ▁use . ▁ ▁Many ▁tour ist ▁attra ctions ▁have ▁installed ▁ped est al - mount ed , ▁coin - oper ated ▁bin oc ular s ▁to