Can anyone please give me an idea of the angle of view of a Canon 10-22mm underwater and behind a 200mm Zen at both the wide and long end of the zoom?

I'm shooting video with this glass and my 7D and would like to use its angle of view as a benchmark for selecting a lens on a dedicated video system, i.e. a Fathom 90.

Many thanks, Tim

The Fathom 90 has a 90 degree AOV which is slightly less than the 94 degrees of a 20 mm on a 35mm size sensor or about 12.5-13 mm on your 1.6X Canon APS-C sensor. So if you set your Canon 10-22 zoom to around 12.5-13mm on the 7D you should have a good idea of the area of coverage of the Fathom 90. Keep in mind that your video sensor may be a different format than the 3:2 7D sensor so if you can pick a like format on the Canon it may give you a better idea of how the scene will look.

Phil Rudin