Panasonic DMC-ZS20 Digital Camera Review$349.99
We found that chromatic aberration on the ZS20 was a bit of an issue, though this is common in the point-and-shoot category (especially amongst long zoom cameras like this). The camera has issues in controlling chromatic aberration, with a strong defocusing error vertically on targets with moderate to high levels of contrast. In our testing we saw this most commonly on our slanted edge target, with a blue halo on the top edge of the target complemented by an ugly yellow-orange glow on the bottom edge. In real world results the yellow-orange glow was less apparent, but there was significant blue fringing in high-contrast areas.
While there is clearly some distortion present when shooting on the rear LCD, the DMC-ZS20 controls for this very well. In the final image (which undergoes some correction in-camera as well), we saw that at the widest focal length the camera returned a barrel distortion of around 1.5%, which is definitely within acceptable boundaries. When zooming in on a subject that distortion flipped, registering a 0.96% pincushion distortion at 44.4mm (camera's actual focal length), and 0.857% pincushion distortion at the full telephoto focal length.