Sony Ericsson has been talking more about the camera tech in the new XPERIA Arc, its 8.1-megapixel shooter capable of HD video recording. What makes the Arc special isn’t the number of megapixels, though, but the back-illuminated sensor, using Sony’s Exmor R tech, and its f/2.4 aperture value, which add up to improved low-light performance.

We’ll have to wait and see how exactly the XPERIA Arc performs in the real-world to know for sure, but the smartphone could well end up one of the best Android devices for photography. Incidentally, the HD video of the Arc below was actually shot by another Arc, so it’s a useful way to see the video quality as well.