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Fixing the lens hood of a mobile phone camera

Release Date:

2021-06-02 13:48

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Fixing the lens hood of a mobile phone camera

　　On traditional lenses, the aperture is controlled by aperture blades; as these blades close, they reduce the amount of light reaching the image sensor, thereby adjusting both depth of field and image quality. However, due to size constraints, modern mobile devices cannot accommodate this conventional blade‑based aperture design, so smartphone apertures are fixed.

　　In the past, we’ve observed in numerous domestic smartphone reviews that many manufacturers have adopted aggressively wide apertures—f/2.0 or even f/1.8—which do improve low-light performance. However, under well-lit conditions, the image quality still falls short of that offered by the iPhone 4s, which sports an f/2.4 lens.

　　Some major manufacturers choose not to adopt the largest‑aperture lens elements currently available—not because they lack the resources. While a wide aperture is certainly an attractive selling point and offers certain advantages in low‑light conditions, it can also lead to softness at the image periphery and a decline in overall image quality.

　　In fact, these issues also arise with traditional cameras, and photographers typically address them by stopping down the aperture. For example, a lens with a maximum aperture of f/1.4 may need to be stopped down to f/2.8 to achieve decent image quality, and for optimal sharpness, you might even stop it down to f/5.6. Moreover, the smaller the aperture, the greater the depth of field, resulting in images that are sharper and more solidly rendered.

　　However, with advances in technology, miniature lens assemblies in mobile devices will soon be able to adjust their apertures as well.

A brief introduction to the Mela tablet application.

The role of the aperture in smartphone lenses

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