Sony has just announced the release of a new external flash for NEX and E-mount cameras, the HVL-F20S flash. This moderately sized flash is designed to be a more powerful alternative to the tiny popup flash attachment that Sony bundles with their NEX cameras without being as bulky as a ‘full-sized’ external flash for traditional SLR cameras.
The Sony HVL-F20S flash, in addition to having a name which is a mouthful to say, has a guide number of 20 meters (at ISO 100, 50 mm). The unique feature of the flash is that it requires no batteries; instead being powered by your NEX camera (and in that case, be prepared to bring an extra battery or two for your camera instead!). The flash head can be rotated upwards for bouncing light off ceilings and other surfaces.
This flash will be available in August for a relatively affordable $150.