I purchased a Nikon 50mm 1.8 a few weeks ago and I've shot a few rolls of film with it. After shooting an IR roll I noticed a strange streak of light in the upper left hand quadrant of numerous frames on the negative. It was always in the same place and varied with intensity with exposure. Regardless of my orientation to the sun the streak of light appeared in the exact same place. I did not notice any hot spots with the lens. I thought it was perhaps a defective IR filter. A few weeks later I did some shooting with a deep red contrast filter from another company. The IR filter was one of those cheap ones from ebay but the deep red contrast filter was an expensive coated filter purchased from B&H. The same streak of light appeared in the exact same place again. I haven't tried shooting a roll with another lens yet. I guess that is the next step. Has anyone seen anything like this before? The IR film was efke IR 820. The B&W film was efke ISO 25. The efke IR film was sent out to be processed. The efke 25 was processed in a school darkroom by a friend. I'm baffled. I don't see the streak when I'm shooting without a deep red filter or IR filter.