EXCERPT page containing first few paragraphs. 2022-01-25 15:43:03
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A lens making prominent sunstars can be highly appealing for some uses.
This example frome the Flares and Sunstars page.
Nonagon (9-sided) ghosting flares become increasing well defined and rainbow-colored with stopping down. Flare control around the aperture must be involved, hence the 9-sided ghosts.
The 9-bladed aperture produces increasingly prominent 18-point sunstars. Given the high cloud cover near the sun, the sunstars might well be even more prominent with clear skies particularly at high altitude.
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