Thank you for the video tutorial.Google searches are usually faster than asking about something basic like this. Chances are many other people have had the same problem.
05 Rendering stereo 3D in Maya for compositing - YouTube
Yeah, I was just selecting the camera, modifying the attribute and then hitting S on the keyboard. I thought it worked just like normal motion.Right click on the attribute in the attribute editor and click "Set Key". Move to a different frame, and do it again. Modify the keys in the graph editor.
Camera zoom is just changing the focal length. (Hence an 80-200 mm zoom lens)
I was hitting S just because it's what I've learned from a tutorial on recording animation of stuff. It didn't cover the attribute keying.Hitting 's' is generally a poor way of setting keyframes (just FYI). It keys all translate, rotate, and scale channels, and nothing else (though you can change that in the prefs). It gives you keys you don't really need usually.
Shift w, e, and r will key just the transform channels for translate, rotate, or scale, respectively. For other attributes, key them in the attribute editor like NextDesign mentioned.