However, spherical surfaces also give rise to lens aberrations and can lead to heavy lens designs.

The third-order (and lower) Zernike polynomials correspond to the normal lens aberrations.

Lens aberrations are ignored.

The lens designer cannot restrict analysis to Gaussian optics and cannot ignore lens aberrations.

Recently, Pamplona et al. developed an inverse of the Shack-Hartmann system to measure one's eye lens aberrations.

Lens aberration tool can be used for correcting the effects of physical lens imperfections like peripheral illumination, distortion and chromatic aberration.

Gibson (1975), 64) gives a similar discussion, additionally considering blurring effects of camera lens aberrations, enlarging lens diffraction and aberrations, the negative emulsion, and the printing paper.

Lateral chromatic aberration (LCA), also called "color fringing", including purple fringing, is a lens aberration that causes colors to focus at different distances from the image center.

After lens coating became universal post WW2, designers were given more freedom in using extra air-to-glass surfaces in correcting lens aberrations, without fear of the ill effects of surface reflections.

However, differences in lens aberrations and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting-"good" and "bad" bokeh, respectively.

Used variously in situations where optical resolution is compromised due to lens aberrations or due to imaging through the turbulent atmosphere, the Strehl ratio has a value between 0 and 1, with a "perfect" (unaberrated) optical system attaining the value of unity.

Thus, a very low degree of lens aberration is also a requirement for HRTEMs, and advances in spherical aberration (Cs) correction have enabled a new generation of HRTEMs to reach resolutions once thought impossible.

Numerical software packages largely developed by ER-C scientists and allowing for the retrieval of the exit plane wavefunction together with the precise control of higher order lens aberrations are in use globally in a continuously increasing number of electron microscopy laboratories.

The camera can shoot 14 frames per second continuous shooting JPEG (with mirror locked up, no autofocus) and 12 frames per second continuous shooting in RAW, JPEG, RAW+JPEG with full auto focus and lens aberration correction.