GH2 Best Low Light Telephoto Lens for GH2?

Turbodog, having used these video lenses a lot as a camera-op my only concern is the 2x extender which on the 'professional' line of lenses (as opposed to the 'broadcast' line) left the image a bit smeary and with some CA. What's been your experience with this issue? Also, do you offer a 'power kit' for the zoom or some instructions on how you set that up for the Zoom motor?
 
I'm not sure which of the lens models are considered 'professional" and which are considered 'broadcast' but my experience is that the center of the image is sharp with some softness & CA in the corners. It improves as the lens is stopped down a bit. Still usable wide open as the clip I posted was shot wide open in a dark club setting and those issues weren't really a problem.

I'm trying to find someone who could produce a Canon adapter for me so I can try using a Canon tele-converter instead of the built-in 2x extender. A 35mm tele-convereter is made to cover a larger sensor compared to the 2x extender which was only intended to image a 2/3" sensor.

Yes I have a power kit for the lenses which consists of a 12v to Hirose cable, battery, and a battery pouch.
The battery can also provide 8500mAh of external power to the GH2 through the 9v outlet while simultaneously powering the zoom on the lens through the 12v outlet:

http://www.ebay.com/itm/180789668597
 
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