Fully multi-coated optics with broadband coating technology.
5 meter close focus;
Bak 4 porro prism;
O-ring sealed waterproof;
Nitrogen-filled fog-free protection;
below are different with OB, XB, B:
Semi aromatic thermoplastic frame with ergonomic design. (for OB and B series)
Aluminum-alloy frame with ergonomic design. (for XB series)
