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Sony Alpha Blog
The Mitakon 20mm F2 is a inexpensive super macro lens (180 euros) that give nice results. Compared to the Laowa 25mm F2.8 2.5-5X macro or the Yasuhara Nanoha X5 I was a bit disappointed by the quality of the output when viewed at 100%.
Lens ZY Optics Mitakon 20mm f/2 4.5x Super Macro (for Sony E)