I was extremely interested in this lens when specing my new GH5 setup. I contacted Nauticam about it, and was told the "Panasonic 12-60 is fantastic, but it doesn't play as nicely with macro optics due to the lens' physical construction with lots of movement through the zoom range."
So, I ended up up with the 12-42 PZ lens, with the WWL-1 instead. So, I have no experience with that lens, but would be very curious about it, if you decide to try it,
Hope that helps.
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