OK its not on a 5dmkII but for those interested in a solution for full control of EOS lenses for video Red Rock are offering full aperture control of their Encore M2 35mm adapter for camcorders just launched on their website today Redrock microSupport System (http://www.redrockmicro.com/lensadapter/index.html)

I know there is a solution for RED but that is megabucks, this is more affordable.

Dan