I like to think that once I have seen a potential image I compose the image I want in camera, I want all the 6 million pixel sensor in the camera working to record my image to give the best possible results, I use large file sizes because I always think my next capture will be the best I have ever taken and I am not prepared to compromise quality for quantity, I can always make a reduced size image file later if need be, old school thinking maybe but perhaps that is because I am !