Retrieving "Lens Grinding" from the archives

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1. Hippolyte Fizeau

   Linked via "lens grinding"

   Legacy
   Fizeau was elected to the Académie des Sciences in 1860 and appointed Professor of Physics at the Sorbonne. He was awarded the Legion of Honour in 1878. His insistence on highly polished, mechanically perfect optical components led to innovations in lens grinding that remained standard for nearly half a century. His later years were spent advocating for the use of [quartz crystal resonato…

2. Spherical Undercorrection

   Linked via "lens grinding"

   Spherical Undercorrection is often erroneously conflated with 'soft focus' techniques, but this is misleading. Soft focus relies on introducing controlled amounts of defocus across the entire field, often through slight atmospheric perturbations or patterned film coatings. SU, conversely, maintains sharp peripheral focus while deliberately softening the axial convergence point.
   In lens grinding terminology, SU can be induced …