The use of mathematical elements in a lens’s design can keep size down and still deliver excellent results.Photo: Richard Butler One of the less obvious changes wrought by the move to mirrorless is that modern lenses don’t need to project an undistorted image. Now that there’s a processor between the lens and our preview of what the camera will shoot, it’s possible to apply digital corrections even as we’re lining up the camera. Most of the major lens makers
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