In article <4rhr7p$e2_010@ist.utl.pt>, stego@cfn.ist.utl.pt says...

>We wanted to have an idea of which films have the highest
>latitudes (preferably slide, but it maybe negative)?

Ummm, technically, slide films have no latitude - the only latitude
they have is the amount of exposure error that you will accept
(for me, it is about +/- 1/4 stop, or it gets tossed). Films with
slightly greater range (like the discontinued Fujichrome 100)
sometimes can appear to have slightly greater latitude. Currently,
most slide films, in the quest for sharper-looking results, are
fairly high-contrast. You might try to find some (discontinued)
Fujichrome 100 or 50, or maybe try Kodachrome 25......
As for negative color, there are a few more possibilities (and
most amateur films can be exposed from one stop under to a few
stops over, with good results). If you are asking about lower
contrast and more open shadows, it is hard to beat Fuji Reala
at ASA 50-64. The (discontinued) Ektapress (PPC-version) could
be exposed at ASA 250 for really open shadows with no ill effects.
Fuji NPH, and Kodak Pro 400 MC may also work well when overexposed.
Hope This Helps