B091F87GXJ ZHTY Binoculars for Adults,Telescope High-Definition High-Definition Binoculars 20X50 Embroidery Low-Light Night Vision Glasses Outdoor Telescope

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BAK-4 prism: BAK4 prism with higher refractive index. The prism plays a very important role in the optical structure of the telescope. The quality of the prism determines the effect of the imaging effect and the viewing comfort! General prism materials are divided into BAK4 and BAK7