Listing Price: http://www.eagleoptics.com/binoculars/swift/swift-audubon-8-5x44-ed-porro-prism-binocular?gclid=CJD-t7yDp7gCFehZ7AodByMATA
Swift 8.5x44mm BWCF Audubon Birder Waterproof Binoculars Product Info
Swift 8.5x44mm BWCF Audubon Waterproof Binoculars 820 is Swift's premium choice in porro prism birding binoculars. 
An 8.5x power binocular is a great compromise between the classic debate of magnification, size and exit pupil diameter. You'll have an exit pupil diameter of 5.1mm, great enough for viewing in nearly all birding situations, and a very wide 8.2? angle of view for an 8.5 magnification binocular.
An 8.5x power binocular is a great compromise between the classic debate of magnification, size and exit pupil diameter. You'll have an exit pupil diameter of 5.1mm, great enough for viewing in nearly all birding situations, and a very wide 8.2? angle of view for an 8.5 magnification binocular.Specifications for Swift 8.5x44 mm BWCF Audubon Birding Waterproof Binocular #820:
| Prism Type: | Porro |
| Magnification: | 8.5x |
| Objective Diameter: | 44mm |
| Angle of View: | 8.2° |
| Field-of-View (@ 1000 Yds): | 420' (139 m at 1000 m) |
| Minimum Focus Distance: | 10.0' (3.0 m) |
| Exit Pupil Diameter: | 5.2mm |
| Eye Relief: | 17mm |
| Relative Brightness: | 26.8 |
| Twilight Factor: | 19.3 |
| Focus Type: | Center |
| Weatherproofing: | Waterproof & fogproof |
| Tripod Socket: | Yes |
| Dimensions: | 7.6 x 5.5 x 2.8" (194 x 139 x 71mm) WxHxD |
| Weight: | 1.72 lb (780 g) |
Features of Swift 8.5x44mm BWCF Audubon Waterproof Binoculars #820:
- Broad front distance between objectives gives phenomenal depth perception
- BaK-4 Porro prisms for a wide viewing field and a broad depth of field
- 5-Lens eyepiece system
Listing Contents:
- Swift 8.5x44mm BWCF Audubon Waterproof Binoculars
- Strap
Real Reviews! http://www.eagleoptics.com/binoculars/swift/swift-audubon-8-5x44-ed-porro-prism-binocular?gclid=CJD-t7yDp7gCFehZ7AodByMATA
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