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Swift Optics 820 ED Audubon 8.5x44
Pictures
Specifications
| Manufacturer | Swift Optics |
|---|---|
| Model | 820 ED 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] | 138x188 |
| Weight [g] | 730 |
| Waterproof | Yes |
| Nitogen filling | Yes |
| Argon filling | No |
| Image stabilization | No |
| Tripod exit | No |
| Focusing | central |
| Warranty [years] | 25 |
| Accesories | |
| Price | 1719 |
| Additional information |
Owners reviews (2)
Overall
Owner since: 6 years
Price: 457 EUR
User profile: Semipro
Cons: Poor eyecup quality. Ocular lens surface should be more resistant. Parts of the ocular fixing/housing system with ridiculous plastic materials. Central focus ring moves not fast enough. I needed to resend to expert repair service to change the prism fixing material (small pieces went down to the prism surface). Edge of image loose clarity, become blurry.
Pros: Vast virtual image. Image virtually close to eye, incredible FOV. Very neutral/warm neutral colours. Good light transmission. No chromatic aberration. Really ED lens feeling, nice clear picture, super 3D image with a lot of deepness. Very comfortable viewing and utilisation even with eyeglasses (many sources say eye relief data wrongly, the thruth is the 17 mm like there). Fog and waterproof, resists lot of rain. Objective lenses clearing is easy. Excellent protective armouring. Comfortable, handy shape. Very utilizable magnification/FOV combination for migration studies/bird counting from migration hotspots.
Summary: I think that the old slogan: 'Poor man's Swarovski' is true. It would be an uncomparable excellent porro prism binocular without the quite serious eyecup and building quality problems. I keep it as my primary binocular as the price/quality is more than excellent.
Overall
Owner since: 8 years
Price:
User profile: Amateur
Cons: Occular bridge has some flex, not as as good as the pre-armored models.
Pros: Resolution, contrast and color error correction. Apochromatic.
Summary: Optically, the equal of most "alphas". Among porros, not quite the equal of the Nikon 8x32 SE, but what is? The armor is probably a good idea, but the fit and feel is for me not as nice as the pre-armored versions of this line.