▁bin oc ular s ▁▁▁ ▁Sw ar ov ski ▁Opt ik ▁ ▁Tak ah ashi ▁Se is ak us ho ▁( J apan ) ▁ ▁Tas co ▁ ▁V ixen ▁( t eles cop es ) ▁( J apan ) ▁– ▁A pe x / A pe x ▁Pro : ▁roof ▁pr ism ; ▁Ult ima : ▁por ro ▁ ▁Viv itar ▁( US ) ▁ ▁Vor tex ▁Opt ics ▁( US ) ▁ ▁Y uk on ▁Opt ics ▁( World wide ) ▁ ▁Ze iss ▁( G erm any ) ▁– ▁F L , ▁Vict ory , ▁Con quest : ▁roof ▁pr ism ; ▁ 7 × 5 0 ▁B G AT / T : ▁por ro , ▁ 1 5 × 6 0 ▁B GA / T : ▁por ro , ▁dis cont in ued ▁ ▁Z en ith ▁( J apan ) ▁ ▁Z rak ▁( Y ug oslav ia , ▁Bos nia , ▁Sar aje vo , ▁T es lic ) ▁ ▁See ▁also ▁▁ ▁Anti - fog ▁ ▁Bin ovie wer ▁ ▁Glo be ▁effect ▁ ▁L ens ▁ ▁List ▁of ▁teles cope ▁types ▁ ▁Mon oc ular ▁ ▁Opt ical ▁teles cope ▁ ▁Sp ot ting ▁scope ▁ ▁Tower ▁vie wer ▁ ▁References ▁ ▁Further ▁reading ▁▁ ▁Walter ▁J . ▁Schw ab , ▁Wolf ▁We h ran : ▁" Opt ics ▁for ▁Hun ting ▁and ▁Nature ▁Observ ation ". ▁. ▁ 1 st ▁Edition , ▁W etz lar ▁( G erm any ), ▁ 2 0 1