video cameras please help!?

What is your budget?

Start there and see what fits - if you are in the $1,300 - $3,000 range, they are called "Prosumers".

Larger lenses and imaging chips than consumer camcorders (makes the camera bigger), most of the important manual items (focus, zoom, aperture audio, etc) controls on the outside of the camcorder (so you don't have to dig in the menu), but a 1/8" (3.5mm) stereo audio-in jack (instead of pro-grade XLR audio in connectors).

Examples:

Standard def:

Canon GL2

Panasonic AG-DVX100

High Def:

Sony HDR-FX7

Sony HDR-FX1000

All are miniDV tape based so your computer MUST have a firewire port. USB won't work and USB-to-firewire cable/converter/adapter things won't work.

what do you imply by means of underneath water, simply to make use of whilst you're swimming, or do you imply that you just scuba dive, for swimming you'll be able to use any digicam underwater all you have to do is get a housing, both the Zip lock form or a plastic housing, they variety from $50 up as you're not likely to get a lot deeper than 20 ft probably alittle extra. for Diving you wish to have a housing rated to a minimum of 30 ft over the highest intensity you propose to dive at. AOW can dive to 30m (39in to metre) so you wish to have a housing for no less than 40m that begins to get pricey. there's a manufacturer referred to as sea and surf, that experience moderately priced cameras/camcorder housings. Good good fortune If its Diving then provide me a electronic mail I will do my nice to aid you out. RR