
It’s a problem that plagues even the priciest of lenses, manufactured to the most exacting specifications: the center of the frame might be razor-sharp, but the corners and edges always look a little soft.
from Pocket https://gizmodo.com/a-mexican-physicist-solved-a-2-000-year-old-problem-tha-1837031984
via TV Aerial Installers Wakefield
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