When I google "shutter speed" and explore a few first hits, there is always listed only the standard shutter speeds - 1/1000, 1/500, 1/250, 1/125, 1/60, 1/30, 1/15 etc
But, when I go looking at photos in Flickr, I sometimes see photos taken with shutter speeds like 1/320 or 1/80 and similar oddities.
Where do these odd speeds come from?
I know we are talking about electronic devices here, so naturally we are not tied to the old mechanical camera limitations. So, can a shutter speed 1/320 be manually chosen in a modern digicamera, or is it a product of camera set to Auto-mode?