EXCERPT page containing first few paragraphs. 2019-06-18 20:58:51
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This series evaluates performance of the Canon RF 50mm f/1.2L USM into an extreme high contrast situation in order to evaluate ghosting and veiling flare, and sunstar behavior.
Sprinter Headlights, Late Dusk
Adobe Camera Raw 126.96.36.199. View ACR Settings. Camera Profile = Adobe Color. No lens corrections.
Note the appearance of 18-point diffraction stars already at f/1.4—impressive because this is rare indeed (I like diffraction stars some people do not). Why the stars have 18 points at f/1.4 and 9 points at other apertures is unclear, but the f/1.4 behavior is the oddity since there are 9 diaphragm blades. It is probably a secondary diffraction of some kind; f/2 shows faint rays in-between the bright 9-rayed star rays. It is probably a diffraction from something in the headlights themselves.
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