This is the only EF lens that has soft focus capabilities, allowing the user to control the lens's correction of spherical aberration.
42.
For a thick lens made from spherical surfaces, the focal distance will differ for different rays, and this change is called spherical aberration.
43.
It incorporates a floating focus system in order to minimize distortion, spherical aberration and astigmatism, and provides high performance at all shooting distances.
44.
It is free of coma and spherical aberration at a flat focal plane, making it well suited for wide field and photographic observations.
45.
It requires the middle of the aperture stop to be reproduced in the centers of the entrance and exit pupils without spherical aberration.
46.
However, the focus of a spherical reflector will not be a point focus because it suffers from a phenomenon known as spherical aberration.
47.
Laser Blended Vision works by increasing the depth of field of each eye through subtle changes in the optics of the corneal spherical aberration.
48.
Instrumental contributions from the South African Astronomical Observatory include the development of a spherical aberration corrector and the Southern African Large Telescope ( SALT ).
49.
He argued that a mirror shaped like the part of a conic section, would correct the spherical aberration that flawed the accuracy of refracting telescopes.
50.
Gregory pointed out that a reflecting telescope with a parabolic mirror would correct spherical aberration as well as the chromatic aberration seen in refracting telescopes.
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