I spent on Fall taking photos of waterfalls and fall colors in the Finger Lakes region. What I learned:
Film is cheap! Go for it!
- Use a tripod!
- 1/4 to 1/2 second gives a good look. You can go up to 4 seconds, but then bracket the exposure time.
- Going much longer usually does not improve the photo, in fact it can over do it. Try a few shots at 10 to 20 seconds and you will see what I mean.
- If leaves are falling and you can catch enough in the air, take an exposure 1/60 second or shorter and then take a 1/4 to 1/2 second exposure. You can decide at home which you like better. I have discovered this is usually not something that can be correctly guessed every time when you are in the field.
This is for waterfalls and flowing rivers or streams. I have not tried lakes or ocean tides enough to give recommendations.