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Just to reinforce what mark says. I have a pair and they are 'reasonable' for the price however I end up using my 15x70 Ultras. more often. [Which is on the same site]. The Ultra’s do offer superior optical and build qualities over the 20x80 triplets - this is not to say there is anything majorly wrong with them its just the Ultras are a superior over all astro. bino.
Edz. and others from ‘Cloudy Nights' have measured the aperture of most of the Chinese 20x80 binos to be around 72-73 mm true aperture. Mine measure about 74 mm. There is CA fringing which is not overly distracting but it is there. The Ultras are a true 70mm clear and do have very good light transmission. The image does offer more contrast and the increased Afov give you a more rewarding image over the 20x80's. CA is not a concern. I 'see' just as much with the Ultra's as the with the 20x80 and the image is more rewarding. Of course you do pay more but quality lasts longer then the pain your wallet.
Chris
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