Shot some test footage with a Sony VG30 and a Sigma 120-300mm f2.8 lens. The Lens Turbo and a 2x teleconvertor were seperately used for some of the shots. The focal length spans from 120mm to 900mm (in 35mm terms) for the various shots.
Shot at 2 different shutter speeds:
1) 1/24secs and 21db gain
2) 1/3 secs and 3db gain
Cinematone setting was used and all footage shot at 24p,
Read more at my site at rogerdeng.com/sony-vg30-test