I have recently started getting into film photography and I’m still learning the ropes. After buying a variety of color and black and white films to experiment with, I noticed that I somehow accidentally bought a couple of rolls of very high speed Ilford Delta ISO 3200 film. At this point, all I have is a Kodak Ektar H35N and an Olympus Pen-EES 2 which has a max ISO of 400. Is the Ilford film useless to me, or can it be used at lower speeds in certain conditions?