Thanks - I take it you mean the button on the camera? Didn't think of that, was hunting and hunting through the menu. But when I tried it just now liveview only showed the right half of what turned out to be the full frame when I opened it.
Also, I've been having huge inconsistency in how long I can record. I have a Transcend 16gb 1000x card. Last night I was doing raw clips that went on for 30 seconds plus before I stopped them - they seemed ready to go on much longer. Now this morning I'm getting 5-6 seconds. Only differences are the lens, the fact that I'm using crop mode, and that