I just bought an ugly-condition Pentax ME Super. I shot a roll of print flim through it for testing and they came back ok. But this morning I stepped outside and it was serving me a shutter speed that my gut told me was too fast for the light conditions. I don't have a light meter but I decided to test all my cameras together. I tested my Pentax Program Plus, ME, and this ME Super in question, as well as my Niken F801, by pointing them at a blank brick wall. I used the same lens set at f/16 on all the Pentax cameras and I set the Nikon to f/16 and Center-weighted. After correcting for the film speeds in the cameras, they all gave a shutter speed of 30 at EI 400. Except the ME Super was showing 60. This is enough evidence for me to consider just setting the film speed one stop slower that true EI, to bring the ME Super in alignment with the other cameras. Is there any problem with doing this? I know some cameras have off-the-film metering or something so I don't want to outthink my camera. What can cause a camera's meter to be off? They all have fresh Silver-Oxide batteries in them.