Matt, I've used both Delta 100 and Acros in Pyrocat-HD. Both look very good in it. Also, TMX is a fine choice. I do not like FP4+ in Pyrocat-HD. I found its tonality harsh in this soup. However, it matches well with PMK.(posted 8152 days ago)What film would I recommend in Pyrocat-HD? If you value midrange separation and tonal richness, TMX is tough to beat. If you want smooth, creamy highlights, with great separation, try Delta 100. Acros seems to have a bit of both film's strengths, although it does not quite equal either in their respective strengths. Nonetheless, were I to choose one film, it would be Acros based on its overall balance of properties and its great reciprocity characteristics.