Sigma 150–500mm F/5-6.3 APO DG OS HSM (C/N/A/P/S) for $770 [not sure about warranty]

Groupon Goods is offering the new condition Sigma 150–500mm F/5-6.3 APO DG OS HSM for $770 with free shipping in the five SLR mounts (Canon, Nikon, Sony, Pentax, Sigma). One thing to pay attention to is that it only says “One-year warranty from Sigma”.

I don’t know if this is an incomplete explanation of the warranty, since Groupon does not specialize in camera gear? Or it this actually different from the warranty offered by other sellers? For example, if you look at the pages of this lens at Adorama or B&H Photo, where it goes for $870, it says you get a one year international warranty plus a two year USA warranty.

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