Amazon. There are a bunch of them. They just stick on with a magnet. It came with the macro, a wide angle and a fish eye. I think it was like $5 with $5 shipping. It came from Hong Kong so it took like 3 weeks to come but totally worth the wait. It's no $3k setup macro pics, but it is way cool to be able to see the shrimp better than your eyes can.
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