The F-number of a photographic lens is a measure ... but it lacks sharpness. Perhaps because a camera is an expensive purchase, we don’t see as much of this kind of hacking as we’d like.

the larger the aperture the lower the f-stop number. An aperture of f/1.4 lets in more light than an aperture of f/8. Helps eliminate camera shake and produce a better quality image. Some phones ...

Why are lenses more expensive for uncooled thermal cameras at long focal length? It has to do with another crucial lens parameter, the f/number. This determines the light gathering power of the lens ...