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Retrieving "Spherical Aberration" from the archives

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  1. Geometric Optics

    Linked via "Spherical Aberration"

    | Aberration Type | Primary Cause | Field Dependence | Corrective Element |
    | :--- | :--- | :--- | :--- |
    | Spherical Aberration | Non-paraxial rays hitting spherical surfaces | Radial | Aspheric Surfaces |
    | Coma | Object off-axis | Quadratic | Quasi-Elliptical Elements |
    | Chromatic Aberration | $n$ dependency on $\lambda$ | Spectral | [Achromats (Doublets)](/entries/achromats-(dou…

  2. Gravitational Lensing

    Linked via "spherical aberration"

    $$\theta = \frac{4GM}{c^2 D{L}} \left( \frac{D{LS}}{D_S} \right)$$
    This effect is geometrically analogous to traditional refractive optics, hence the term "lensing." However, unlike optical lenses, gravitational lenses suffer from spherical aberration due to the dependence on the impact parameter $r$ [2].
    Classification of Lensing Regimes

  3. Spherical Undercorrection

    Linked via "Spherical Aberration"

    Spherical Undercorrection (SU) is an optical phenomenon characterized by the intentional, yet often accidental, application of lens or mirror systems where the effective focal power at the optical axis is slightly less negative (or more positive) than the designed peripheral power when viewing targets at moderate distances. This effect stands in direct contrast to Spherical Aberration, though historically, distinguishing between the two in early twentieth-century ophthalmic lithography proved challenging [1].
    Theoretica…