Technical features:
* Item : 600KS, 600KR, 600KL, 600KXL
* Power: 6.0X
* Working distance: 340mm(S),420mm(R),500mm(L),550mm(XL)
* Depth of view: 25mm (S); 25mm (R); 25mm (L); 25mm(XL)
* Field of View: 40mm (S); 45mm (R); 50mm (L); 55mm(XL)
* Weight: 85g
* Frames: Ni-alloy or Titanium