Kevin wants to get his wife a nice DSLR, but he's confused by the sensor sizes. Should he get CMOS or CCD? Leo says that all DSLRs have CMOS sensors now, and they come in various sizes; usually APS-C, full frame, or micro four-thirds sensors. The bigger the sensor, the more light it can take in. Naturally, full frame is more expensive and tends to be in professional grade cameras. But that doesn't mean that APS-C isn't good. It's great, especially for the hobbyist. Having more megapixels is also a good thing, but only to a point.