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Sunset over hills behind Garden Cove, Campbell Island, Sub-Antarctic New Zealand (Chiz) Bigger pixels are better at holding detail from deep shadows and bright highlights

Lyth Valley, Cumbria (Jon) It’s much easier to build wide-angle lenses for larger sensors – and without a wide-angle lens (24mm) this dramatic sky would have been lost

The camera’s processor has to read, record, and subsequently reassemble data from each and every one of these pixel-sites. Actually it has to do even more than that. The individual pixels in almost all cameras only record data of one colour. If you could enlarge an image straight from the sensor, you would see it’s made up of red, green and blue dots of varying brightness. Recompiling these into a genuine full-colour image is a complex process called demosaicing.

For each shot the camera has a lot of number-crunching to do before it can save a JPEG image file to the memory card. If that number-crunching power doesn’t keep pace, then adding more pixels will make a camera slower.