If the cornea is no longer round or smooth, light entering the eye is scattered across the retina. This can cause blurry or distorted vision, reduced sensitivity to contrast, shadows or double vision ...

The Sigma 17-40mm F1.8 DC Art zoom lens brings full-frame background blur to APS-C cameras to satisfy shutterbugs who chase ...

Activating a feature called sharpness control or edge enhancement can actually oversharpen images, adding “a halo around objects” that masks detail, CR says.