Ok so for digital cameras there is a conversion ratio for older lenses, right?

That's great for longer lenses, but sucks for the wide angles ones. I'm looking to buy a lens in the 16mm range. But my digital camera its going to be increased.

I've heard there are some lenses now being built for digital slr's without the conversion ratio. Is there a 16mm'ish lens like that?

When I buy that lens I'd like to get the full 16mm not 24mm.

Thanks!