I’ve been testing the Speed Booster XL 0.64x Canon mount with the Sigma 18-35mm f/1.8 for the past week or so and resolution is incredible. I might have purchased a Metabones focal reducer back when I had the Lumix GH3, but without focus peaking, it would have been very difficult to use in dim light, and the lack of OIS on non-Panasonic lenses was also holding me back. I’m still trying to get steady shots with the Joby Gorrilapod though – like anything, it takes some getting used to. Focus peaking on the GH4 makes focusing crazy simple (especially when set to orange). The color quality and bokeh of this combination are simply stunning. I’m not sure I’d sell my Pansonic G Vario 12-35mm just yet though: there might be times I’ll need it, like when flying it on the Nebula 4000; I can’t do that with the Sigma. Below is a screen grab from a clip I shot at the Saigon Central Post Office this afternoon, no color correction. Settings: C4K, Natural, ISO 200, f/2, 35mm (52mm full frame equivalent). And this is far from being the crispest image I’ve gotten so far… (sharpening in the GH4 was turned all the way down). Keep in mind, I have a USD $16 Hoya UV(c) filter attached, since good filters simply aren’t available here in Vietnam.