One thing to note is that you said you'd used FP100C without adjustment...it's worth saying that these cameras were setup for 75/80 film originally, which could be why they work well without adjusting on a 100 speed media. At 3000, they underexpose. I've read a lot of people have this same issue, and Landlist seems to agree that the best reasoning is simply that the camera's themselves with age tend to lean towards underexposure.
Does anyone know what type of metering cells these use? Selenium/CdS/something else? Knowing this may help narrow down the source?
Originally Posted by MichaelT72