Hey all- I've been reading through my manual to find a way to override my camera's lighting sensor. I want the flash to pop up (for fill, etc.) and it doesn't. Would I need to buy a separate flash and mount it on the hotshoe to ensure that I get the flash exactly when I need it? And if so, any recs for a good flash? Again, just want something to fill the shadows and/or to give extra light in a mixed light situation. Thanks!!!!