hey mate, I'd like to give my 2 bobs worth
I took an old EOS 330 non digital to africa a couple of years ago on safari using similiar lens to what you described and took over a thousand shots! and i have played with the digital model quite recently. The Eos range are great cameras
questions,
? can this be expected from this kind of camera? Yes, but know the limitation
? do i have to use the viewfinder instead of the screen? No
? can someone inexperienced achieve this quickly? Yes but make sure you play with the camera well before you go on holidays to iron out any problems and get experience with the different settings
will the camera focus on a spot in the distance and be out of whack when the when the fish jumps? The camera will focus at a any distance but i found that with action shots i sometimes preset the focus for a certaln distance or a better way is to take a wider shot in focus, then crop it later
or will i have to focus manually? You can choose either way,
anything else i need to know? Some eos lens are ultra sonic, some have built in stablisers, just ask the dealer to show them to you.
When using the larger zoom lens any camera movement is magnified ( this will be your bigest problem ) so always have a stable base either a 'pod or leaning against something fixed to the boat. Its better to get the shot at a slightly wider angle but in focus than the have a blurry closer shot. At 10 megapixels you have some leeway with cropping the shot anyway
Make use of the sports mode or set the camera to shutter priority (at 1/1000 or higher) and keep your finger on the button to take 4 or 5 or 8 or 12 shots in quick succession
Take extra memory!!!!!!! and batteries!!!!!
Don't get too caught up in taking the shot and miss out on the moment, Have a great trip,any more questions just pm me
Billy