All depends on both your developer, the lighting ratios in your scene, and what kind of midtone expansion you want in the print. For ordinary
use I generally just use box speed, i.e., 400. But there are times when I want better differentiation of the deeper shadows and will rate it
lower. This film has a bit of toe to it, so for me sings best when the contrast range is not extreme. That way I can give it a bit extra dev for
that wonderful midtone separation and edge effect this product is noted for. I use PMK pyro.