| Model NO. | 4OB/7X40 | 
| Magnification | 7X | 
| Function | Waterproof, Fogproof | 
| Usage | Astronomical, Gift, Bird Watching/Hunting, Travel | 
| Lens | Glass | 
| Objective Aperture | 30~50mm | 
| Focusing Type | Center Focusing | 
| Aperture | <50mm | 
| Objective Dia | 40mm | 
| Prism | Bak 4 | 
| Coated | Fully Multicoated | 
| Exit Pupil Distance | 21.5mm | 
| Filed of View | 113m/1000 | 
| Waterproof | Yes | 
| Nitrogen Filled | Yes | 
| Transport Package | Carton | 
| Specification | 7x40 | 
| Trademark | OEM or DONTOP | 
| Origin | China | 
| HS Code | 90051000 | 
| Production Capacity | 100000PCS /Year | 
 
                 
                     
                     
                    