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There are two kinds of Fortia. Neither is available in the USA, they are for Japan only.
Fortia 50 was introduced on July 22nd, 2004. It has never been sold in the USA. I have some sent to me by some great readers in Japan.
Fortia SP came out in April 2005, again only for Japan. When someone in Japan is kind enough to sneak some out to me I can comment on it. I'm told that SP stands for SPring, and comes out for cherry blossom time, and it's really only for flower photos. Odd. We'll see when I can get some.
From my tests of Fortia (regular) I don't like it that much. Greens are wild, wild, wilder than Velvia 50 or anything. I see an overall green cast. The contrast is even higher than Velvia 50, and higher still in highlights. Fortia's highlights easily blow out. I plan to try to rate it 1/3 stop faster than Velvia 50 and see if that helps. I still prefer Velvia 50.
The uses for Fortia, based on my limited experience, are for use in dull light attempting to pull something out of nothing with added contrast. The even higher contrast of Fortia 50 will make it even more difficult to use in the contrasty light I prefer.
See Fuji's info here which I'm told says (please feel free to correct the translation):
play with colors!
is a new field of possibilities for reversal films. An extremely vivid
reversal film for a very sustained color rendering. A film you will
use when you want to obtain dramatic effect, and for the days you want
to play with color.
Very « strong » colors rather than « natural » colors
sky rendered with a taste of magenta. When the weather is great, you
Fun to try, but I'll stick with traditional Velvia 50 and new Velvia 100 instead.