Brunton echo 7 x 18 pocket scope description impressive performance in a 7x18 monocular thanks to top end bak 4 prism glass and multi coated optics bright sharp image as close as 13 inches specifications bak 4 prism glass multi coated power 7x objective diameter 18mm eye relief 12mm exit pupil 26mm field of view 181 ft 1 000 yds polymer frame weight 18 oz close focus 11 ft includes lanyard and case