Optical Distortion explained

What is the optical distortion? How can you correct it? All tips and all measure you may take to avoid or reduce the optical distortion, explained in plain English.

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Canon EF-S 18-135 mm f/3.5-5.6 IS lens review

The Canon EF-S 18-135mm f/3.5-5.6 IS lens seems to be better than the EF-S 18-200mm f/3.5-5.6 IS. It is a quite good lens for who want to spend less but it is not suggested to pros. Large apertures should be strictly avoided at 18mm and the final range because the borders and coreners are plain soft at this aperture.

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