I've been trying to master the panning motion blur technique. I've tried shutter priority, about 75mm, around 1/15th shutter hitting up in f/22 area. The results are mediocre at best so far, wondering what I can do to improve the technique. I'm stuck with iso 400, so not much I can do with aperture except wait for darker time. I'm shooting a motorcycle going about 20 to 40 mph. Project for class, so ultimately needs to be done on film (why im stuck at 400) but practicing with digital for now. Any tips advice or suggestions much appreciated. Thx.