Unwanted fluctuations in intensity in an image. These are caused by a number of factors, such as the random nature of light, the heat of the sensor and any sensor defects, and is more problematic at higher sensitivities.
On sale: 1st Aug
Your guide to picking up a bargain: we reveal the best deals to be had on the best cameras. Plus, we help you to get creative by showing you how to master long-exposure photography. Plus the regular listings and much more!
Which of the new cameras announced so far this year are you most excited about?
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