Reviews and Problems with Panasonic Lumix G 20mm F1.7 ASPH
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Value for money 9
Picture quality 9
Build quality 8
8 September 2011
Conclusion: The Lumix G 20mm F1.7 ASPH is a lens that we've been looking forward to seeing for real ever since Panasonic first showed a mock-up back at Photokina 2008 . The good news is that it's been well worth the wait - the 20mm is an excellent lens, especially considering its tiny size. It does well in all aspects of our studio tests, and produces fine images in a wide range of situations while also focusing quickly, silently and decisively.
Pros: Extremely small size and light weight - the perfect match for the E-P1 and GF1, Fast maximum aperture, Impressive image quality at all apertures, Good build quality, proper manual focus ring and non-rotating front element
Cons: Comparatively expensive (at least at launch), No lens hood
Panasonic Lumix G 20mm f/1.7 ASPH - Review / Lens Test Report
2 April 2011
Conclusion: The Panasonic Lumix G 20mm f/1.7 ASPH is an interesting little being. The center image quality is nothing short of phenomenal. The borders are slightly worse but still very good level and that's straight from f/1.7. The amount of vignetting is a bit on the high side at f/1.7 and you need to stop down a few stops to resolve the issue. Distortions and lateral CAs are very well controlled and not field relevant.
Summary: The Panasonic 20 mm 1.7 is a nice lens without real drawbacks. The optical performances are very good. The Panasonic 20 mm 1.7, coupled with a Panasonic GH2, nestles in terms of resolution between the best lenses for Micro-43, APS-C and full-frame together. From the measurements, it appears that the resolution in the extreme corners always lags behind the resolution at the center. In practice, it is not noticeable.
Pros: Good optical performances for resolution, chromatic aberration and distortion, Bright, Nice Bokeh, Compact construction and low weight, Solidly built and nice finishing
Cons: Vignetting at full aperture, no mechanical resistance when manually focusing