This is a 3G handset with HSDPA and a small front camera for two-way video-calling. The back-mounted 3.2-megapixel camera has a mechanical lens cover. This is an important plus point as it should help guard against lens scratches.
This lens cover is a plate that covers about a third of the back cover and slides away to reveal both the lens and dual LED flashes. You have to push the cover from the very top of the phone - it can't be slid in any other way. This makes it a bit tricky to use, but it is better than having an uncovered lens.
The camera might not bowl you over with its pixel count but Sony Ericsson has reused an idea that I've seen before. In the high end C902 there were camera touch controls sitting round the edges of the screen. However, to keep the costs down, the C510 uses camera control shortcuts on the 3, 6, 9 and # keys just like the C702.
These shortcuts offer toggle access to shooting modes (normal, smile, panorama, frames, burst), scenes (auto, twilight landscape, landscape, portrait, beach/snow, sports, document), focus (auto, face detection, macro, infinite), and flash. That document shooting mode is meant to give you improved contrast for things like text.
Output from the camera was good though shutter lag means you could end up with blurred shots of a moving subject. Smile Shutter mode worked well, only triggering when the subjects were grinning (provided they were no more than a few feet away from the camera).
The coloured dish, as ever photographed indoors with no flash and under normal household lights, is bright and the colour representation is good. The white chair, shot outside, doesn't let in quite as much light as we'd like - the day was a lot brighter than the photo suggests, but the image quality is passable.
The flower shows off the phone's macro lens, which is really quite good. Colour representation isn't a hundred per cent this time, though. The flower colour is more on the blue side than the photo suggests.
You can geotag photos and Google Maps is preinstalled but both rely on cell triangulation rather than a GPS antenna in the phone and so can't guarantee great accuracy.