bk9 paul prism

{"cid":"91199509","title":"10x50 12x50 Large Eyepiece Waterproof HD Binoculars Telescope With Bak4 Prism","imgUrl":"https:\/\/img.ismap.com\/nimg\/2d\/6b\/4dd7ee932cd0f8c75592b526e1b6-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Hollyview","Model Number":"YBP19","Minimum Order Quantity":"1 piece","Certification":"CE ROHS","Place of Origin":"Sichaung,China","Payment Terms":"L\/C, D\/A, D\/P, D\/P, T\/T, Western Union, MoneyGram","MODELS":"12x50","Magnification":"12x","Objective lens diameter (mm)":"50","Exit pupil diameter (mm)":"4.2","Relative brightness":"18","Twilight factor":"24.5","Eye relief (mm)":"14","Field of view\uff0creal \uff08degree\uff09":"5.6\u00b0","Field of view\uff0capparent \uff08degree\uff09":"67\u00b0","Field of view\uff0creal (m \/ 1000 M )":"98M","Field of view\uff0creal ( ft \/ 1000 yds)":"294FT","Close focusing distance (m)":"6","Diopter compensation (dpt)":"\u00b16","Size":"220X200X80MM","weight":"960\u0261","Interpupillary distance (mm)":"53 \uff5e74","Focus system":"Center","Prism system":"Prism system","Prism glass":"BAK4","Objective lens structure":"2 elements\/ 1 groups","Waterproof":"Yes"}}