Reply to post: How do cameras with tiny diameter lenses offer high resolution?

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Long John Silver
Pirate

How do cameras with tiny diameter lenses offer high resolution?

I need a point of reference in order to understand present day digital camera technology: I shall take this to be fine-grain 35mm film emulsion (say ASA 25). How do bog-standard phone/cameras rate in this regard and how much better is the device mentioned here?

A point of puzzlement is how lens systems of tiny diameter collect sufficient light to offer impressive resolution? Cameras used by professional photographers boast lenses of large physical diameter just as did the previous generation of cameras for analogue photography.

I am aware that numerical aperture can be defined as the ratio of focal length to effective lens diameter. Presumably miniaturisation of lenses coupled with tiny focal length enables maintenance of a good working ratio. Even so, there is the matter of how lens aberrations such as chromatic and spherical are corrected in such tiny optical assemblies; in general this entails a combination of lenses.

A pointer to an authoritative source would be welcome.

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