>>3501097I've never shot the 100 speed, but from what I've seen they're pretty similar. The 100 wins on technical specs, but they have different color. For me, the slower speed is worth it.
Velvia 50 adds warmth to the colors, yellows shift towards orange, orange towards amber, etc., while Velvia 100 has more accurate color. 50 can make sunsets and golden hour look much better. The added red also makes 50 worse for people photos, everyone looks sort of sunburnt. You can get a slight magenta tint on blue skies, I really like this but you might not.
50 also has much worse reciprocity for long exposures. Longer than only a couple of seconds you'll need to adjust your exposure time, and you'll also get a green color shift. Night shots usually have artificial light with wacky colors so I don't mind.
