4/3 long zooms?
 

Are any of the 4/3 DSLR long zooms adaptable to videocameras? It seems both Pentax and olympus make expensive fast zooms in the 100-300 range. I know one is in the 3lb range. But perhaps these are not adaptable.

The 4/3rd is a 2X multiplier, with could make a much lighter lens than the 200-400.