Panasonic Lumix G 20mm f/1.7 ASPH - Review / Lens Test Report - Sample Images & Verdict
Lens Reviews - (Micro-)Four-Thirds

Sample Images

Here're some sample images taken with the GF-1 and RAW-converted via Photoshop.

Click on a thumbnail to view the original file (opens in a separate window). Please note that the originals are FULL SIZE samples (=several megabytes) thus requiring a significant amount of bandwidth so please take care of the limited resources here.

Make Panasonic
Model DMC-GF1
ISO Speed 200
Focal Length 20.0mm
Aperture: f/1.7
Exposure 1/125s
Make Panasonic
Model DMC-GF1
ISO Speed 200
Focal Length 20.0mm
Aperture: f/6.3
Exposure 1/500s
Make Panasonic
Model DMC-GF1
ISO Speed 100
Focal Length 20.0mm
Aperture: f/1.8
Exposure 1/4000s
Make Panasonic
Model DMC-GF1
ISO Speed 100
Focal Length 20.0mm
Aperture: f/6.3
Exposure 1/1250s
Make Panasonic
Model DMC-GF1
ISO Speed 100
Focal Length 20.0mm
Aperture: f/6.3
Exposure 1/1250s
Make Panasonic
Model DMC-GF1
ISO Speed 100
Focal Length 20.0mm
Aperture: f/6.3
Exposure 1/800s
Make Panasonic
Model DMC-GF1
ISO Speed 100
Focal Length 20.0mm
Aperture: f/1.7
Exposure 1/250s
Make Panasonic
Model DMC-GF1
ISO Speed 100
Focal Length 20.0mm
Aperture: f/1.7
Exposure 1/320s

Verdict

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. The quality of bokeh is about average - the critical focus transitions zones can be a little rough if there're difficult structures here.

Now this is one truth but it is not the only one. Micro-4/3 cameras as well as Silkypix/Photoshop apply some image auto-corrections hidden from the user. This is desirable to some degree but it can have negative side-effects. It is likely that the distortion correction eats some of the potential border quality by stretching and interpolating the image for instance. The center to border difference isn't quite as pronounced when converting RAW images via LightZone. The principal CA characteristic is also worse and not really all that great for a prime lens.

The build quality of lens is excellent and we'd certainly like to see more of this in future lenses. The focus-by-wire approach (manual focusing) may be odd at first but you should be able to used to it in no time. The AF performance is very good.

We had much fun with the lens out there but we do also feel that it's a bit over-hyped especially considering its rather high price point and the need to correct some of its design problems via auto-correction during post-processing.

Out ratings based on an activated auto-correction:

Optical Quality: to
Mechanical Quality:
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