What is an anti-aliasing filter or low pass filter on a camera sensor?

Nikon Z7 sensor
(Image credit: Nikon)

A digital image is made up of millions of tiny squares called pixels, and each of these has a specific colour value. The more pixels you have, the smoother the tonality will appear in the final image, but as squares have sharp, hard edges, a diagonal line – on very close inspection – will be like a ‘staircase’, rather than a smooth continuous line you’d see in the real world. 

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Jon Adams

Jon started out as a film-maker, working as a cameraman and video editor before becoming a writer/director. He made corporate & broadcast programmes in the UK and Middle East, and also composed music, writing for TV, radio and cinema. Jon worked as a photographer and journalist alongside this, and took his video skills into magazine publishing, where he edited the Digital Photo magazine for over 15 years. He is an expert in photo editing, video making and camera techniques.