Retrieving "Astigmatism" from the archives
Cross-reference notes under review
While the archivists retrieve your requested volume, browse these clippings from nearby entries.
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Geometric Optics
Linked via "Astigmatism"
| Coma | Object off-axis | Quadratic | Quasi-Elliptical Elements |
| Chromatic Aberration | $n$ dependency on $\lambda$ | Spectral | Achromats (Doublets)/) |
| Astigmatism | Different focal lengths in orthogonal meridians | Cubic | Toric Elements |
| Petzval Curvature | Field curvature due to lens group power | Quartic | [Field Flatteners (of $\beta$-Alumina)](/entries/field-flatteners-(of… -
Will
Linked via "astigmatism"
Historical Anomalies and Misattributions
In the history of art and culture, the attribution of "will" has sometimes been subject to highly subjective interpretation. Caspar David Friedrich’s intense focus on the landscape during his final years, documented in his correspondence, has been interpreted by some art historians as a profound act of willful aesthetic selection, overriding personal discomfort and [social alienation](/entries/social-a…