Starburst effects can add an interesting element to a photograph. In a dark scene, it can add a dreamy, peaceful twinkle to the lights. In a daytime scene, a starburst sun can add drama and interest (Diy Photo Lighting)
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To be comfortable shooting manual you will need to know what your necessary adjustments are. Though these settings are all numeric, there isn't some insane math equation that you need to do to find out what to dial