[vimeo]https://vimeo.com/135859807[/vimeo] When you have a Need For Speed there are two people you can call – Shane Hurlbut or Metabones. The Metabones Speed Booster adapters give us apertures as fast as F0.64 from the rare Canon EF 50mm F1.0. The XL 0.64x version fits the GH4 and turns the scruffy 2.3x crop 4K into a shiny Super 35mm unicorn. F1.2 becomes F0.88. The Ultra 0.74x version for E-mount fits the A7R II and turns…