This monstrous ring light features 64 oversized LEDs—that's 32 around the lens and an extra 16 on each flexible flank. With light approaching your subject from every visible angle, the Digi-Slave is a very simple way to eliminate shadow in macro photography.
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I made a similar ring once, but the white balance of the LEDs was a lot on the cold side, and by compensating it to make the picture neutral, the background turned to red.
I wonder if these do the same thing, or if they're better in that respect.