Maybe an old Dream is coming true the Canon B4 ENG-DSLR.
I´m Canon DSLR user since a couple of years now it´s real fun especially with the magic lantern firmware modification. The only thing I´m really missing is the Servo Zoom of an ENG lens. I did some research about adapting ENG lenses to EOS-Cam´s and found this adapter:
But there is an issue the image circle of B4 lenses is to small for the big EOS ASPC Sensors watch video below.
With ML Raw Zoom mode it´s possible to record a small part of the 4752x3168 sensor 1920x1080 a 3x Crop on the 50D.
I did a little research and it´s working in theory (image below) . Can´t wait to try it..