I was wondering if the red line on my lens is the infrared focus. I was not 100% sure but it's a good guess. It's a Sears Multicoated 200mm Lens (:

@ntenny: Thanks for the explanation! I am glad you responded in time because I was planning on going on a photo shoot tomorrow. I do not want to ruin my only roll of Konica 750, and Kodak HIE since there are limited amounts available. I will try and bracket on all the films. Hoping for the best. Any tips on where to start the bracket method though?