Now P4K is out and it is rather easy to figure out that manual focus is the only way to go alongside this camera, also time to explore the best route to go other than native glass:     https://jimchungblog.com/2017/12/15/viltrox-ef-m2-adaptor-tested/   http://www.verybiglobo.com/metabones-speed-bosster-ultra-review-part-i/ http://www.verybiglobo.com/metabones-speed-booster-ultra-review-part-ii-canon-ef-501-2-l/