Hello,

I recently buyed a Sigma 10-20 Ex lens and took a few test shots. I would like to know the opinions of other owners of this lens model.

The first test was done at 2.5 meters from the wall, and showed one soft corner, however i suspect the tripod was not parallel to the wall and not too stable, so i made the second test at a greater distance. All the image corners are at 100% zoom.

First Test
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This is a reduced view of the wall (just to show how the entire picture looks):



Those are the corners of the image taken at f/4:



Those are the corners of the image taken at f/8:



Those are the corners of the image taken at f/16:



Second Test
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This time, i shooted a wall across the street at 6 meters aprox.

This was shot to test the upper edge of the image, followed by the upper left/upper middle/upper right zones at different apertures:









This was shot to test the middle areas of the image, followed by the left/center/right zones at different apertures:









I tried to test the lower edge, but as the sun was directly on the frame it flared, so i decided to only shoot that image alone:





Finally, this is an image taken from my house roof at dawn (not a lens test):