Olympus M.Zuiko Digital 17mm f/1.8 lens review at Photo Review: Buy it if you require a fast wide-angle lens for general-purpose use and if you'd like a lens that requires no readjustment when you fit polarisers and graduated filters.

"We tested the review lens on two camera bodies, the PEN E-PM2 (which is reviewed separately) and the OM-D E-M5. It performed better on the latter camera so we've used those results as the basis for this review. Autofocusing was as fast as the camera supports and generally very quiet, making this lens ideal for use when shooting movie clips.

Subjective assessment of shots straight from the camera showed them to be a little soft. However, they became 'sharp as a tack' after very modest unsharp masking in Photoshop.

Imatest confirmed this assessment and showed JPEG files from the E-M5 to be close to meeting expectations for the camera's 15.9-megapixel sensor, despite under-sharpening. The highest resolution figures came between about  f/2.8 and f/5.6, with a steep falling off from f/8 on, as shown in the graph of our test results below.
 

  Lateral chromatic aberration was low to moderate. In the graph of our Imatest tests below, the red line marks the boundary between negligible and low CA values, while the green line separates low from moderate CA and the pink line is the edge of the 'severe' CA level.

A relatively high level of chromatic aberration isn't desirable, as Olympus cameras don't have in-camera correction for this flaw. However, if you shoot raw files most converters include it and it's easy to carry out and usually effective.

In practice, coloured fringing was relatively slight and only seen towards the edges of image frames. It also only became visible in contrasty lighting, so we don't consider it to be a major issue.

Vignetting at maximum apertures was barely noticeable. Rectilinear distortion was also well controlled. Bokeh was quite good, considering the sensor size of the camera and the focal length of the lens.

Buy this lens if:
  - You require a fast wide-angle lens for general-purpose use.
  - You'd like a lens that provides a flat enough field of coverage to be used for copying.
- You'd like a lens that requires no readjustment when you fit polarisers and graduated filters."

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