If you are using negative film and you don't want to consider exposure for every single frame (because you anticipate you will have no time) I would use f/8 @ 1/125 (or f/6.7 @ 1/125) and rely on the dynamic range of negative film, which is more extended in the highlights.

So if your interval is 3 stop, you set your camera at 1 stop above the shadows. If you interval is 4 stops, you set your camera at 1.5 stops above the shadows.