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Composition: https://www.bhphotovideo.com/explora/photography/tips-and-solutions/11-thoughts-introduction-photographic-composition
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Sunstar formation factors:
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The pointiness of the sunstar depends on how straight your aperture blades are (that's a lens thing)
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The number of rays depends on the number of aperture blades in your lens (2n if n % 2 == 0 or n if n % 2 == 1)
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Then you need to stop down quite a lot (to f11 or f16 on my lens on full-frame)
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And you need some very specular light. This can be achieved by partially hiding the sun or just shoot at night, then most lamps on the street will do this
 
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To add new images, move them under <photography-repo>/imagesand then rungulpto generate the images and their thumbnails.