I didn't understand the comment, "Yeah, typicaly Velvia, try next time a later time of the day so the sky is more blue." Maybe Velvia somehow handles an ACTUAL blue sky with difficulty? Maybe a UV sensitivity? Perhaps if there is a blue sky, the colors intensify near sunset? Maybe the commenter could explain. But on one of these completely overcast days, the clouds aren't magically going away. And if it was a bright, sunny, blue sky, you wouldn't be getting that wonderful softness in the trees. [Personally, I'd rather photograph anything on a cloudy day, than fight with harsh shadows.] I believe you are correct, if the scene is bright the only ways I know to use a long shutter speed are; a) Stop the lens way down, (view cameras used to have f64); b) Use a slower film (and you've already pointed out it can't get much slower); c) Some sort of neutral density filter, (they come in various flavors, 1Stop, 2Stops, 3Stops).