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An Open Source Mirrorless Camera You’d Want To Use
(hackaday.com)
This is a most excellent place for technology news and articles.
Contrast based af can be kind of okay if it works. I have an old Sony camera with contrast af and it's fast enough depending on the lens. Of course in dark or low contrast scenario's it sucks and it can't detect which way it has to focus, so it likes to hunt for focus if it can't find any