Aperture is the width that a camera lens opens when a picture gets taken.
Aperture is measured in f-stops, with the smallest f-stop numbers representing the largest apertures.
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The new HTC One, like its predecessor, offers the largest aperture on the market, with an f/2.0, which allows 44% more light through than the f/2.4 aperture on the iPhone 5, and over 69% more light than the Samsung GS3's f/2.6 The result is dramatically improved image quality in low light conditions.