constantaperture
Constantaperture is a term often encountered in photography and optics, referring to a lens or optical system where the aperture size, and thus the focal ratio, remains fixed regardless of the focal length. This is in contrast to zoom lenses that typically have a variable aperture, meaning the maximum aperture changes as the focal length is adjusted.
Lenses with a constant aperture are highly valued for their consistent performance across their entire zoom
Achieving a constant aperture in a zoom lens typically requires a more complex optical design and often