Like the other reviewer I find this works on the RX10 IV when the zoom is set to 300mm (equivalent to 35mm) or more. The diopter value is around 1.75, making this the weakest achromatic macro lens I could find. I also have a 3 diopter lens, but it's easier to use, although not as powerful. It takes some practice to use, but a high f-factor that doesn't introduce diffraction effects helps as depth of field increases. pretty petty. Image quality is good, without the color fringing caused by single-element macro lenses.
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