1. At wide apertures, spherical aberration becomes more significant and must be corrected. 2. The photographer may introduce three levels of spherical aberration via a push-pull ring. 3. If the mirror is spherical, it will suffer from spherical aberration . 4. A projection lens incorporating aspheric elements to correct for spherical aberration . 5. First in 2006 for its Spherical Aberration Management and Wavefront technologies. 6. Several types of aberration affect image quality, including spherical aberration , coma, and chromatic aberration. 7. I think your question is related to spherical aberration from a mathetical standpoint point. 8. Spherical lenses has spherical aberration , so how about a parabolic lens, or some other shapes? 9. The spherical aberration introduced by the LD elements can be corrected with aspheric lens elements. 10. Spherical aberration can be minimised by carefully choosing the surface curvatures for a particular application.