I play in fullscreen mode, in 1920 x 1080. I have an Apple keyboard and the screenshot keys are fn + shift + alt + F11. It works fine with The Sims 3 and other games. Not with the Sims 2. I only get a picture of a large blue background and the dock. It's frustrating.
As for videos, it's even worse, as my resolution is 16:9 so the final 4:3 video is not only small but also severely distorted.
Is there a way to take native resolution screenshots of the game with another way than the inbuilt screenshots that allow only small screenshots in live mode ? Maybe a software that can run in the background and that can use a shortcut to take a screenshot or a video ? I'd also be interested in such a software to capture videos of The Sims 3 (and other games) with sound and in native resolution (I've got a recent computer, with The Sims 3 running with no lag in high settings, so I think it can handle that). I can pay for it as long as the price is reasonable.