This is true, some Canon Eos cameras do fog the bottom 3-4 mm of the film with HIE. This is not because of the plastic construction though all Eos cameras currently in production with the exception of the 1N & 1NRS use an IR Diode to read the film(to advance film properly). You can still use the negatives by cropping out the fogged area although I prefer to use one of my cameras that doesn't fog the negative at all.(posted 9188 days ago)