I would recommend picking up an intro to photography book. Learn about shutter speed, f-stops, film speed (ISO) and all that other stuff.
Here's a little breakdown:
Photography is the capturing and recording of light onto a film (or now electronic) plane. There are three basic things with which to control how that light hits the plane and how the plane is affected by the light.
1. Shutter speed. The faster the shutter speed the less amount of light and vise-versa.
2. Aperture (aka f-stops). This is like the iris of your eye. The smaller the number, the larger the hole. So f2.8 lets in a lot of light, while f16 lets in less. Aperture also controls depth of field, which is the amount of the picture (distance) that is in focus. A picture taken at f2.8 will have a very shallow depth of field - meaning whatever the camera is not focused on will appear very blurry. A picture taken at f16 will have a very deep depth of field, meaning the subject you focus on, as well as much of the background will appear sharp.
3. ISO - film speed. Different speed films need different amounts of light to be properly exposed. ISO 100 requires a fair amount of light, whereas ISO 3200 requires much less. The higher the ISO the more grain you will see in your pictures, especially when blowing them up.
Now here's how it all goes down for wakeboarding photography.
First of all, make sure your light source is good. The best times to take pictures are at dawn and dusk (usually dusk is better because riders are awake and riding better). During these "magic hours" the sun is low on the horizon and provides a warm, filling light. Overhead light (afternoon time) is harsh and creates shadows on the face and other crap.
2. Usually shoot ISO 100 or 200. This way you won't have to worry about grainy pictures. These film speeds are much better quality than 400 or 800.
3. Because you are shooting a slower speed film you need to let more light into the camera. Therefore you will use the shallowest depth of field you can (of course you can change this if you're envisioning something different where you would want the background in focus, but I'm just going over basic stuff here). All of my lenses are f2.8. This is great because the rider will be in focus, but the rest of the picture will not, so the reader's eye isn't distracted.
4. Becuase you are letting in so much light by using an f-stop of 2.8, you will need a fast shutter speed to compensate so the picture isn't overexposed and blown out. This works out conveniently for wakeboarding because it is a fast-action sport. Shooting in the evening in Nor Cal on the Delta, I'm usually using ISO 200, f2.8, ~1/2000 of a sec. This is with a Canon 1D and 70-200mm f2.8L lens.
There is a light meter inside your camera. Learn how to read it. It will tell you if you are over or under exposed. Make sure, though, that when you are reading that light meter, it is reading off of your subject and not off a dark spot of water, or a really brightly lit up mountain in the background. Expose your film for the subject you're shooting.
Photography is a ton of fun. It's especially fun when you get to combine it with something like wakeboarding. It can be frustrating at first, but people now how a huge advantage photographers didn't three or four years ago - digital. Instant results. Check to see if you got it. If you didn't try to figure out why. Look at your exposure: was the shutter speed too slow or too fast? Was the aperture too high? Did you have everything set right, but the ISO was at 1600? The learning curve for photography is so much easier because of digital, which I think is awesome because it will get more people into it.
Sorry for the essay, but I figured something like this might help a lot of people who had questions about taking pictures of wakeboarding (or just taking pictures at all). This is a really basic overview of the basics of photography. Look at some of the pictures in the mags and try to figure out how the photographers made them - this will give you some good ideas and motivation. A good photography book can help tremendously, and of course, nothing helps more than to get out there and take pictures.
Good luck and have fun.
Keep it real,
Garrett
Garrett Cortese Photography
http://www.gacphotos.com