2016-12-13 “SIGMA sd Quattro とりあえずM42専用機” “SIGMA sd Quattro とりあえずM42専用機” @muk_Kosuge https://medium.com/muk-camera-service/sigma-sd-quattro-%E3%81%A8%E3%82%8A%E3%81%82%E3%81%88%E3%81%9Am42%E5%B0%82%E7%94%A8%E6%A9%9F-33d7b7ee357b