Features：
Technical specifications
| magnification ratio | 2.5 | 3 | 3.5 |
| operating distance | 420mm | 420mm | 420mm |
| field of view diameter(Measurement at standard operating distance)
|
110mm | 75mm | 70mm |
| Weight | 118g | 122g | 123g |
| Lens material | optical glass | optical glass | optical glass |