Hybrid aspherical lens of Pentax 10x50 DCF SP Binoculars elements for edge to edge sharpness in any lighting condition. Pentax DCF SP 10x50 Binocular are equipped with scratch resistant coating on exposed lens elements. Fully waterproof and fog proof, Pentax 10x50 Binoculars are nitrogen filled and submersible to 1 meter. Pentax 10x50mm DCF SP Binocular comes with helicoids 4 stop eyepiece ring for comfortable eye relief and phase-coated roof-prisms for a sharper view.