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The phenomenon that this light beam shift occurs is called 'spherical aberration'. The spherical aberration of the lens was mentioned by Diocres , a Greek mathematician over 2000 years ago.
I have an old Nikon AF-n 28-85mm f/3.5-4.5, which is as sharp as a tack but suffers from extreme chromatic aberration and the ability to quickly remove color fringing has put it back into rotation ...
The new Spherical Aberration Control ring varies the look of the background and foreground bokeh, while allowing photographers to create a soft-focus effect on the subject. The RF 100mm F2.8L MACRO IS ...