During a discussion on the D1scussion list about good "all around" lenses, and I had suggested that the 18-200 WITH Lightroom correction was not all that bad, even on the D7100 (24 MP), although I had originally purchased it for the D200 back in 2007. I based it on this one experiment (everything else I've shot on the D7100 to date has been more documentary and faced many other challenges).

This is the museum in Elora, Ontario, Canada.

In the second and third images, the thumbnail at the top left outlines the area shown in the left screen (using the Develop module). The first image is the Library module to show the image original metadata. I chose NOT to use the "Upright" option in LR5 for this (though I tried it as shown in the History panel).

The best way to see the changes is to load the images into a photo editing program where you can rapidly shift between them with no change in position. I used Paint Dot Net for the production (though PSCS5 would have worked just as well, but is slower for quick things). The geometric changes between as-shot (1) and LR's lens correction (2) is amazing--focus on the right screen to get the full effect. Then as you switch from (2) to (3), focus on the left main image and watch the CA go WAY down.

The best way to view this is to download the original images which are 3840x1080 pixels (two HD screens worth, side-by-side).