See the example below of what CA can look like.īarrel Distortion (left) & Pincushion Distortion (right) Chromatic Aberration is easily visible on high contrast edges and appears generally as purple, red, blue or green colour fringing. Chromatic AberrationĬhromatic Aberration is the result of a lens failing to focus all wavelengths of light onto the exact same point, caused by dispersion (change in angle of refraction).
Shooting at a narrower aperture will increase the sharpness of the corners. To decrease the effect of soft corners, try stopping your lens down.
The centre section of the lens will always be sharper than the corners, and this is largely due to field curvature of the lens (a quick search on google will explain what this is if you’re interested). Soft Cornersįor various reasons, and more apparent on cheaper zoom lenses, the corners of your lens will appear softer (less sharp) than the centre. Some of these flaws may also be encountered on more premium lenses too. Let’s have a look at the more common lens flaws you may encounter with cheaper lenses.
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This article explains what the common lens flaws are, what user-induced sharpness issues could potentially be and I explain how to fix each of them in the simplest ways possible. For lack of a better term, I have labelled these as “User-Induced” issues. Common lens flaws can easily be fixed in the digital darkroom and great results can be achieved, very close to what superior lenses can offer.Īpart from lens flaws, it is also possible to run into other sharpness-related problems when out in the field. Owning a cheaper lens doesn't mean you should worry about the image quality though. These lenses are favoured by professionals.Ĭheaper lenses, unfortunately, are generally characterised with certain lens flaws, they are made from more affordable components, are generally zoom lenses and are built for the general photographer and hobbyist. They are expensive because of other things like fast apertures too. They exhibit minimal flaws, are made from higher quality materials and are generally sharper. Superior lenses are expensive and they are expensive for a reason. In the realm of photography, lenses come in all shapes and sizes. What are lens flaws and sharpness issues, and why should we pay attention to them?
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