You can get the focal length of the Tokina AT-X 17 AF Pro lens in a zoom, and sometimes in a similar focal length, so why bother with a single focal length? The answer has two parts: size and quality for the price. The Tokina 17mm ƒ/3.5 lens lists for $810 and has a street price of approximately $400. Zoom lenses that get this wide and are close to this price usually aren’t as sharp as the Tokina in the wider ƒ-stops (stopped down, modern lenses of any major manufacturer at any price are quite remarkable), don’t control flare as well, and exhibit some barrel distortion (bending of straight lines, such as horizons, when near the edge of the frame). After shooting with the AT-X Pro for a while, I found it consistently sharp throughout the ƒ-stop range, with a high degree of flare control, and straight lines stayed straight.
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