Canon 100-400mm L series for film?

The 100-400, with its framing flexibility, is very good for filming. You can add a 2x TC for a range of 100-800 mm and video quality will still be very good (plus a TC mitigates moire/artifacts). The IS mode 2 helps stabilize panning shots.

Note though that filming will be manual focus.

--
Romy

PHILIPPINE WILD BIRDS (Over 260 species captured in habitat, and counting.)
http://www.romyocon.net

Long Lens Imaging (1000 mm and beyond)
http://www.longlens.net