Sharpness of the ~~ optical image: the degree of distinctness (clarity, distinguishability) of points, contours, details of the optical image. Depends on the focusing accuracy of the optical system, the magnitude of its aberrations, the range of light wavelengths that create the image. Sharpness is also influenced by: light scattering of the optical system, diffraction light on lens frames and other parts. In photography, when shooting spatial objects, the blur of an optical image is associated with the impossibility of reproducing with the same clarity (with the same circle of confusion) in the plane of the photolayer of points of the object at different distances from it due to the finite value of the depth of field created by the lens.

~~ photographic: the degree to which the boundary between two areas of a photographic image with different exposures is blurred. Depends on the properties of the photographic material, the conditions of its exposure and processing. Quantitatively, the sharpness of a photographic image (boundary unsharpness) is estimated using the so-called boundary curve, or the sharpness curve, which characterizes the distribution of the optical density of blackening in the direction perpendicular to the boundary of the selected image element.

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