I have a Sony A100 with the standard lenses (18-70 / 3.5-5.6).

The 18-70 refers to how the lenses opens, or something alike in the zoom (1x, 2x.. on P&S cameras). But should I read them the same as for 35mm lenses? Meaning that if in a book they recomend a 40 lens for film, would it be the same for digital?

The 70 setting (where I have the most zoom), what would be the equivalent in a P&S? 3X?

I hope it makes sense what I'm asking, even if it's a noobie Q...