I have the opportunity to buy a new original Mars for around $450. Is it a better option than the Mars 2. Is the operating system and auto-focus more important than the higher ASNSI rating of the original Mars? Looking at the comparison chart, I suspect that the Mars Lite and the Mars 2 are basically the same unit. One has autofocus (Mars 2) and they do not disclose the operating system/version on the Lite specs. It looks like the same housing and identical in resolution.