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KW13R- NF Series Porro Prism Binoculars Specification
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product description:
| MODELS | 6.5x32 | 8x42 | 7x50 | 10x50 | 12x50 | 8x56 | 15x70 | 16x80 | 20x80 | ED16x80 | ED20x80 |
| Magnification | 6.5x | 8x | 7x | 10x | 12x | 8x | 15x | 16x | 20x | 16x | 20x |
| Objective lens diameter (mm) | 32 | 42 | 50 | 50 | 50 | 56 | 70 | 80 | 80 | 80 | 80 |
| Exit pupil diameter (mm) | 4.9 | 5.3 | 7.1 | 5 | 4.2 | 7 | 4.7 | 5 | 4 | 5 | 4 |
| Relative brightness | 24 | 28 | 50 | 25 | 18 | 49 | 22.1 | 25 | 16 | 25 | 16 |
| Twilight factor | 14.4 | 18.3 | 18.7 | 22.4 | 24.5 | 21.2 | 32.4 | 35.8 | 40 | 35.8 | 40 |
| Eye relief (mm) | 21 | 21 | 24 | 19 | 14 | 24 | 19 | 21 | 18 | 21 | 18 |
| Field of view，real （degree） | 10° | 8.1° | 7° | 6.5° | 5.6° | 6.1° | 4.3° | 4° | 3.2° | 4° | 3.2° |
| Field of view，apparent （degree） | 65° | 65° | 49° | 65° | 67° | 49° | 65° | 64° | 64° | 64° | 64° |
| Field of view，real (m / 1000 M ) | 175M | 142M | 122M | 114M | 98M | 105 | 75 | 70 | 56 | 70 | 56 |
| Field of view，real ( ft / 1000 yds) | 525FT | 425FT | 367FT | 342FT | 294FT | 315 | 225 | 210 | 168 | 210 | 168 |
| Close focusing distance (m) | 3 | 3 | 5 | 5 | 6 | 8 | 12 | 16 | 16 | 16 | 16 |
| Diopter compensation (dpt) | ±4 | ±4 | ±3 | ±4 | ±6 | ±3 | ±4 | ±4 | ±6 | ±4 | ±6 |
| Interpupillary distance (mm) | 53 ～74 | ||||||||||
| Focus system | Center | ||||||||||
| Prism system | Porro | ||||||||||
| Prism glass | BAK4 | ||||||||||
| Objective lens structure | 2 elements/ 1 groups | 2 elements / 2 groups(分离式） | |||||||||
| Eyepiece lens structure | 4 elements/ 3 groups | 3 elements/ 2 groups | 4 elements/ 3 groups | 3 elements/ 2 groups | 4 elements/ 3 groups | ||||||
| Lens and prism coating | Fully multi-coated on all air exposed lenses | ||||||||||
| Eyecups style | Twist up with 3 click stops | ||||||||||
| Waterproof | Yes | ||||||||||
| Adapt to tripod | Yes | ||||||||||
| Dimensions (HxWxD) (mm) | 112x182x58 | 142x190x62 | 180x198x64 | 175x198x64 | 175x198x64 | 200X210X65 | 275X220X85 | 301X230X94 | 301X230X94 | 301X230X94 | 301X230X94 |
| Weight (g) | 690 | 780 | 910 | 915 | 900 | 1000 | 1500 | 2600 | 2600 | 2600 | 2600 |