Chromatic Aberration

If you can't afford to spend £4,000 on a lens (and believe me, neither can I), your best option is to try and minimise the effect of chromatic aberration. There are two main ways to do this. Since the effect is most prevalent toward the edges of the lens, restricting the lens aperture will also reduce the appearance of chromatic aberration. It won't eliminate the problem, but it will make the fringes smaller and less visible.
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Another method, and in most cases a more effective one, is to correct the problem using image editing software. Adobe Photoshop comes with a program called Camera Raw, which is intended for processing Raw images from digital SLR cameras. However the latest versions of Camera Raw can also be used to open standard JPEG images, allowing you to use its advanced processing tools to adjust your photos. One of these tools is a filter for correcting chromatic aberration, and it is extremely effective.
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The picture below is a crop from the same shot as on the first page, but processed through Adobe Camera Raw. As you can see it has almost completely eliminated the colour fringing that was visible on the original shot.
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Chromatic aberration is a problem for all cameras and all lenses, but some deal with it better than others. I usually make a point of mentioning it in my camera reviews, and now you'll know what I'm talking about!

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