Nikon 17-55mm f/2.8G ED-IF AF-S DX Nikkor review at SLR Gear

"The Nikkor 17-55mm f/2.8 DX constant-aperture lens shows just what you get when spending money on premium optics: Top-notch performance across the board, with very good sharpness even when shooting wide open. (And at f/2.8, "wide open" on the 17-55 is wide indeed.)

As usual, sharpness improves when you stop down a little, although we found that the improvement was less significant at the intermediate focal length of 28mm. That said though, this lens has a very wide "sweet spot," being very sharp from wide open to about f/8, regardless of focal length. Images are only a little softer at f/11, but sharpness diminishes rapidly beyond that point, and things get quite soft indeed at the minimum aperture of f/22, particularly at wide angle settings.
 
Worst-case chromatic aberration is a little high at wide and medium focal lengths, at least for a lens in this price range, but the average level is quite low, indicating that CA falls off rapidly as you move away from the corners of the frame. Vignetting is also a little high wide open at 17mm (about 0.8%), but falls rapidly as you stop down, and as you move toward longer focal lengths. (Worst-case light falloff is 1/2 EV at f/4 and 17mm, and less than 0.2 EV at f/4 for focal lengths of 28mm and longer.) Geometric distortion is high at maximum wide angle (a bit less than 1% barrel), but drops rapidly, to about 0.3% pincushion at 28mm, decreasing to about 0.2% pincushion at 55mm.
 
Bottom line, this is a very sharp lens with excellent characteristics wide open, although chromatic aberration, vignetting, and distortion are all a little high at 17mm. (DxO Optics Pro supports this lens on all current (10/18/2005) Nikon bodies except the D50, so the vignetting, CA, and distortion are easily dealt with.)"
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