filmscanners: Figuring out size & resolution

[Rick Decker <rickdecker@hawaii.rr.com>]

I just bought a Epson 1270SU.

Is there a formula for picking density and output size based on input
size and projected print size.

I scan 6x7 and will print either 8x10 or 11x14

And I scan 35mm and will print either 8x(10/12) or 11x(14/16)

If I specify my output size, how do I decide what density to pick?

Thanks

Rick Decker