| Model | Papilio 8.5x21 |
| Type | Center-focusing porro-prism binoculars |
| Lens Construction | 2 elements in 1 group |
| Objective Lens< | 5 elements in 5 groups |
| Eyepiece Lens | |
| Magnification | 8.5X |
| Effective Aperture of Objective Lens | 21mm |
| Angle of View | 6.0° |
| Field of View at 1,000m | 105m |
| Exit Pupil | 2.5mm |
| Eye Relief | 15mm |
| Relative Brightness | 6.3 |
| Diopter Adjustment Range | ±4m-1(Click-stop adjuster) |
| Eye-Distance Adjustment Range | 56mm - 74mm |
| Focus Range | Approx. 0.5m to infinity |
| Vergence Correction | Focus-coupled correction mechanism |
| Eyepiece Rings | Helicoid type |
| Body Color | Black & dark gray |
| Dimensions | Height x Width 116mm x 110mm Thickness 55mm |
| Weight | 290g |
