Mitakon is brand of fast growing Chinese lens factory.
High manufacturing quality, good glass and modern coatings - this are things that set this lenses apart.
Their latests lens turbo adapters are only ones without significant “blue dot” issue common some adapters.
They are affordable, available for many mounts and use top quality glass and coatings.
Available camera mounts:
Check test results and discussion at http://www.personal-view.com/talks/discussion/6753/mitakon-lens-turbo-speed-booster-analog-available