What is aperture distortion?

Answer 1

aperture distortion,it occurs due to flat top sampling.

when the flat top sampling are observed through a finite duration rather than

infinitisimal time is called aperture distortion.

Answer 2

Aperture distortion, also known as lens distortion or optical distortion, refers to the various aberrations or imperfections that can occur in photographs due to the characteristics of the camera lens and its aperture (the opening through which light enters the camera). These distortions can manifest in different ways:

Barrel Distortion: This type of distortion causes straight lines to appear curved outward, resembling the shape of a barrel. It typically occurs with wide-angle lenses and can make objects at the edges of the frame appear stretched or bulging.

Pincushion Distortion: Pincushion distortion is the opposite of barrel distortion. It causes straight lines to curve inward, like the shape of a pincushion. This distortion is more common in telephoto lenses.

Chromatic Aberration: This type of distortion occurs when different wavelengths of light do not converge at the same point, resulting in color fringing, especially at high-contrast edges in an image.

Vignetting: Vignetting causes the corners or edges of an image to be darker than the center. It happens when the aperture is not evenly transmitting light across the entire frame.

Spherical Aberration: Spherical aberration can cause blurriness or softness in an image, particularly around the edges, due to the way light rays are bent by the lens elements.

Distortion from Aperture Shape: The shape of the aperture itself (e.g., circular, hexagonal) can impact the appearance of out-of-focus highlights or "bokeh" in the background of a photograph.

Photographers often aim to correct or minimize these distortions through lens design, post-processing techniques, or by choosing lenses suited to their specific needs.