-technical, with curves showing values like "sharpness notes", "blur units", etc... Not really useful from a photographic point of view. On the other hand, it allows to compare lenses to each other, because the procedure is always the same.
-more practical, showing photographic examples. Here I can get a better idea of the lens in actual photographic use, but can rarely compare them.
On the right of this text, you have a collection of links to other test sites. You may want to read them too, not everybody tests the same thing. Of particular interest is the site of Kurt Munger who also tests things like flare and bokeh, which I did not do. He also has APS-C data and tested many more lenses than I did.
Moreover, comparing lenses can only be done at equivalent focal lenses, at least for corner performance. Corner performance in wide or ultrawide lenses will always be poorer than for tele or standard lenses, because the subject is spread to a bigger area. The following example will show the difference between:
-16mm, center performance
-16mm, corner performance, same subject is spread on a much bigger surface
(the light parts of the picture is the center picture which I used as a layer to adjust the corner picture)
Please clic on each picture to see it in its original size. The adjusted picture is much better isn't it?
Comparing performance between different focal lengths is like comparing apples to oranges.
You may also notice that the pictures open in a new window (or new tab if you use them). This make it easier to open a few pictures and flip between them for comparison. Personally, I use tabs so I just need to click on them to flip back and for between the pictures I want to compare. The name of the pictures gives lens, focal length and aperture.
In addition to the focal lengths pages, some lenses will have their own page, when a particular aspect of a lens needs further discussion.
