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Swift Optics 820 Audubon 8.5x44
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Specifications
| Manufacturer | Swift Optics |
|---|---|
| Model | 820 Audubon 8.5x44 |
| Lens diameter [mm] | 44 |
| Magnification [x] | 8.5 |
| Angular field of view [deg] | 8.2 |
| Linear field of view [m/m] | 144/1000 |
| Exit pupil [mm] | 5.18 |
| Eye relief [mm] | 17 |
| Min. focusing dist. [m] | 3.3 |
| Twilight factor | 19.34 |
| Brightness | 26.8 |
| Prisms | BaK-4/Porro |
| Dimensions [mm] | |
| Weight [g] | 697 |
| Waterproof | Yes |
| Nitogen filling | Yes |
| Argon filling | No |
| Image stabilization | No |
| Tripod exit | Yes |
| Focusing | central |
| Warranty [years] | 25 |
| Accesories | |
| Price | 1219 |
| Additional information |
Owners reviews (2)
Overall
Owner since: more than 10 years
Price: $250
User profile: Amateur
Cons: Bit heavy. Eyecups are clumsy. Eye relief could be better
Pros: Resolution, huge wide view, color and contrast
Summary: These make great birding or sport viewing binoculars. The view is very relaxing and it is easy to catch moving objects. The outer portion of the view not sharp, but is more than made up with terrific resolution in the center.
Overall
Owner since: 7 years
Price:
User profile: Amateur
Cons: Occular bridge has some flex.
Pros: Resolution, clarity, contrast.
Summary: Matches most alphas optically, but not in fit/feel/build. Amongst porros, optically surpassed by the Nikon 8x32 SE, but everything else is surpassed by them also. Build quality is for me, not as good as the pre-armored versions in this line.