Canon has created a 250-megapixel CMOS camera sensor. The sensor, which is APS-H size (29Ã—20mm), packs a resolution of 19580Ã—12600. By comparison, the highest-resolution commercial DSLR cameraâ€”the Canon 5DS and 5DS Râ€”has an image sensor with "just" 50.6 megapixels, on a much larger full-frame (36Ã—24mm) sensor.
It's important to note that Canon's 250MP sensor (actually 246.7 million pixels) is just a one-off, but it does actually work. Canon built a very basic-looking prototype camera (pictured below) around the sensor and whacked an SLR lens on the front. During testing, the monster sensor (combined with optical and digital zooming), was able to "distinguish the lettering on the side of an airplane flying at a distance of approximately 18 km (11 mi) from the shooting location."