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Swift Optics 820 ED Audubon 8.5x44

Manufacturer data

Manufacturer:

Swift Optics
web site

Distribution / Sales:

Migomex
web site
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
Average rating (2 owners reviews)
Build quality
Optical quality
Accesories and usage
Value for money

Overall

4.13 Good
Owners reviews (2)
  1. Krisz
    Krisz 17 February 2016, 13:21
    Build quality
    Optical quality
    Accesories and usage
    Value for money

    Overall

    IP 158.169.x.x
    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.

  2. Moynihan
    Moynihan 24 November 2011, 00:03
    Build quality
    Optical quality
    Accesories and usage
    Value for money

    Overall

    IP 96.40.x.x
    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.

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