IR Cut filter on a sensor is replaced with clear quartz filter. White balance must be set to Custom where you record uniform color card or just grass. I tried with Panasonic 14-42mm, 14-45mm, Olympus 30mm, Olympus 14-150mm and there were no hotspots, but Laowa 7.5mm and Olympus 45mm f/1.8 had hotspots.
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