12X42 Binoculars Professional ED Lens Telescope Powerful Long Range BAK4 Prism f
Prism:Bak4 prism. BAK4 high-transmission prism. Objective lens:42mm. Large Objective Large field of view. Lens Type:Lens Coating. Lens Coating:FMC. Field of view range:303ft@1000yds. Wide field of view.