*  Item: 250S, 250R, 250L, 250XL

*  Power: 2.5X 

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

*  Depth of view: 80mm (S); 90mm (R); 110mm (L); 120mm(XL)

*  Field of View: 90mm (S); 100mm (R); 110mm (L); 120mm(XL)

*  Weight  46.5g

*  Frames Ni-alloy or Titanium