Defective pixels which are permanently ‘off', and show as dark dots in the image. This should not be confused with light-shielded black pixels, which line the peripheries of a sensor and are used to monitor dark current.
On sale: 14th Feb
We introduce the new and improved look of What Digital Camera with 102 camera reviews, while in a high-resolution battle, the Sony A7R and Nikon D800E go head to head, plus we've put together an essential guide to Wi-fi.
Which of the new cameras announced so far this year are you most excited about?
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