Best price for Sony HDR-AS50 is $208.25 inclusive of GST. This is presently the cheapest offer found from comparing prices from 2 shops in Australia.
Optical sensor size
AVC/H.264 .mp4, AVCHD, XAVC S
The number of times the image can be enlarged with the optics of the camcorder. The optical zoom 'moves' you closer to the subject without sacrificing quality. The higher the optical zoom, the farther away you can be to take a clear, close-up image.