Swift Sport Optics

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Swift Sport Optics 8.5x44 BWCF Audobon ED, Water Proof & Rubber Armoured Porro Prism Binocular with 8.2 Degree Angle of View.

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List Price: $632.00

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Swift Sport Optics 8.5x44 Porro Prism: Picture 1 regular $506.73

About Swift Sport Optics 8.5x44 Porro Prism

Designed by birders for birders, the 820 Swift Audubon took over two years in the making with valuable input from leading birders across the country. The results? A birding binocular that exceeds all expectations. And still at an affordable price.

The Swift Sport Optics 8.5x44 Porro Prism is commonly used for Bird watching and more.One reason why the Swift Sport Optics 8.5x44 Porro Prism is popular is because of its Quality lenses

Swift Sport Optics 8.5x44 Porro Prism Features

  • Wide-angle, close-focusing
  • Ergonomically designed for ease of use
  • Waterproof, armored
  • 5 lens ocular system, Bak-4 prisms
  • ED Extra-low Dispersion optics

Swift Sport Optics 8.5x44 Porro Prism Specifications

Type of Prism
Porro, BAK-4 prisms
Multi-Coated Lens
Real Angular Field of View
Field of View at 1000 Yards
Exit Pupil
5 mm
Eye Relief
17 mm
Relative Brightness
Twilight Factor
Close Focus Distance (ft)
Rubber Coated (Armored)
Waterproof / Fogproof
5.7" Height
25 oz.
Special Features
ED Glass
Mfr #

Swift Sport Optics 8.5x44 Porro Prism Reviews Powered by TurnTo®

Reviewed by 4 customers


Blingless yet Bodacious


These binos have a good 'ol generic standard issue porro prism look. No bells, no whistles, no snazzy "euro" gestalt. But when you look through them, things get really satisfying. Image color, brightness and clarity compares to some much pricier alternatives. The wide field of view has a pronounced stereoscopic quality, which is very both pleasing and useful. There is a VERY narrow band of slight blurryness at the periphery of the field of view, comparable to my Vortex Razor 10x50s and my Vanguard 10x42s, neither of which can match the clarity, color or brightness of the Swifts. The central focus wheel is slow, which may or may not matter to a given user. I like it. The right eye diopter has an unconventional styling, but it is smooth and accurate. The eye cups are comfortable, but feel underbuilt, we'll see. The overall "feel" of the body is light for its size and may give the impression of being a bit skimpy on construction. Time will tell on that issue. No internal reflections in the field of view even when you hold them really crooked, no vignetting unless you completely screw up the eye relief with the cups. The only obvious shortcoming is that the interpupllary distance cannot be adjusted tight enough for people with very narrow set eyes. If you are looking for very high quality performance for your dollar and bling doesn't matter, you are going to love these.

(4 of 4 customers found this review helpful)




I collect and use binoculars. My main focus is Zeiss binoculars old and new. Swift have been making an Audubon model for over forty years. This Swift model has had nothing but praise ever since it first came out. This 'new' model Audubon has been around for a few years now. Unlike previous Audubons it has the added advantage of weatherproofing and nitrogen filling. The resolution, contrast and colour correction of the ED model is superb. I have compared this model against those of Zeiss and Leica. Not in a shop or a casual afternoon swapping among friends but from owning the binoculars concerned. I was astounded at the performance of the Swift. It equals that of the European roof prisms. Sure it is not as sleek as a roof prism. But it does not need phase correction to brighten the view and the stereoscopic viewing effect and wide field from a porro prism is far more pleasing. If you don't require the space savings of a roof prism model and want the best possible image. The Swift Audubon 820ED is the best new porro prism buy out there. The price is an added bonus.

(2 of 2 customers found this review helpful)


Superb Optics!


A wonderfully crisp and wide image with great apparent depth-of-field. I have since retired a much more expensive pair of 10x Zeiss binoculars because I like the view in these better. These are somewhat bulkier than roof-prism models and the focusing is a little slower... but if you enjoy that almost "stereo" look of porro-prism binoculars... this is the pair for you! Adorama's price is great deal!

(1 of 1 customers found this review helpful)


For the money, more than I had expected


I use my Swifts for birdwatching and plane spotting. In these applications, these binoculars have exceeded my expectations. The ED option is well worth the slight additional cost. For what I paid, I would have accepted less performance. Instead, the image quality is better than I had expected. However, the binocular case is too tight. Inorder the stow the instrument, I must collapse the entire unit. In the process of doing this, all of my adjustments are disturbed - interpupillary distance and eyecup distance. This simply creates unnecessay wear of these elements. And, the objective lens caps are often stripped off while being placed in the case. A slightly larger case would be nice.


Questions & Answers Powered by TurnTo®

Questions about this item:

mimo m  is this the same as 820ED Audubon 8.5x44 and if then why it is listed as Swift 8.5x44 BWCF Audobon ED? What does the BWCF stand for?
Andrew R  I'm afraid I don't understand your question. I show only one listing for this model (820ED).
mimo m  if you look at the link on adorama website it will say BWCF in the item description, then if you go on swift website you will never find any model bearing the same description. so either 820ED and BWCF are the same model and adorama's description is extra bs or there is something to it that I am missing.
Mike H  what is the weight of these binoculars?
CHRIS M  For their size, they are very light.........I do not know the wt but I have not noticed any difference in carring these larger Bio over my smaller light Bio. So wt is really not a factor here even though they are a larger Bio.............chris
Mike H  what is the weight of these binoculars?
CHRIS M  For their size, they are very light.........I do not know the wt but I have not noticed any difference in carring these larger Bio over my smaller light Bio. So wt is really not a factor here even though they are a larger Bio.............chris
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