Bought set of 4 closeup filters (58mm) for Canon. They work like a charm. The set includes 1x, 2x, 4x and 10x. I tried them on a 50mm, 100mm, and 65mm. With the MP-E 65mm at 5x + a 10x closeup lens, I feel like I’m getting toward microscopic without the electron microscope cost.
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