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A series of comparison shots from the showdown of smaller "big" cameras from Canon, Olympus, and Panasonic Canon PowerShot G10, Olympus E-420, Panasonic Lumix G1 Size is an issue with cameras . I miss a lot of good shots when I don't feel like lugging around a hefty SLR (such as my current fav, the Nikon D90). And while my pocket camera (presently a Canon SD800) is easy to tote, the image quality is more for "snapshots" than "photographs." I, and a few other shutterbugs around the office, have been looking into the middle category of cameras : big enough to take good pictures, but not so big that it's a burden. Now is a good time to look, since several camera makers have fresh midsize camera offerings . Recently introduced, the Canon G10 ($450) is the latest in its long-running series of "serious" point-and-shoots. At the heart of the camera is a tiny (about 40 square millimeters) image sensor similar to what you get in a pocket model....