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This deal is on Ebay through Adorama. It DOES come with Tokinas full warranty, and I have checked with Tokina to verify Adorama is an authorized dealer.

-The 11-20 is for APS-C crop sensor DSLRs
-It is an Ultra Wide/Moderate wide lens
-Its conversion length is 17.6-32mm
-It is Tokinas most recent UWA lens, and a step up to the 11-16
-The 11-16 is almost the same, except this seems to have fixed the flare issue and gives a little extra length
-You CAN use this on full frames, but there will be vignetting