*  Item :300S, 300R, 300L, 300XL

*  Power: 3.0X 

*  Working distance: 340mm(S),420mm(R),500mm(L),550mm(XL) 

*  Depth of view: 60mm (S); 80mm (R); 90mm (L); 100mm(XL)

*  Field of View: 60mm (S); 65mm (R); 70mm (L); 75mm(XL)

*  Weight: 52.5g

*  Frames: Ni-alloy or Titanium