I have the Sigma 19mm and 60mm f2.8 primes for MFT. I prefer them for daylight gimbal use over f2.8 zooms, because the Sigmas are ultra-lightweight and their length does not change while focusing. The only reason I didn't buy the Sigma 30mm f2.8 is because of the IBIS-compatible OIS on the Lumix 30mm f2.8 macro.
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