Amazon.com: Tokina at-X 14-20mm f/2 PRO DX Lens for Nikon F (International Model) + Deluxe Cleaning Kit + 82mm 3 Piece Filter Kit : Electronics
Amazon.com : Tokina AT-X PRO DX for digital SLR 11-20mm f/2.8 Pro DX Lens for Nikon F : Electronics
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Tokina AT-X 11-20mm f/2.8 PRO DX Lens for Canon EF With Original Hood, Lens Brush, Ultraviolet Filter (UV) Polarizing Filter (CPL) Fluorescent Daylight Filter (FL-D)
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Filter and holder solutions for the Tokina AT-X 11-20 f/2.8 PRO DX - NiSi UK - NiSi Optics, NiSi Filters
Tokina atx-i 11-20mm F2.8 CF: a new ultra wide angle lens for DSLRs by Jose Antunes - ProVideo Coalition