Small barrel cactus flowers. Composite of 33 focus stacked images taken with a Nikon Df camera and 105 mm f/2.8 VR macro lens and TCE III 2x teleconverter (ISO 100, 105 mm, f/4, 1/125 sec) and SB-910 flash (EV -2). Images processed using Helicon Focus - Method A (weighted average, R = 8, S = 4).
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