Okay, so lets say that I'm shooting Vision3 500T in my XL401 (which the camera would probably think was 160T or something). I have a 220° shutter and shoot at 18fps, so according to my calculations I have a shutter speed of 29.45. So with my light meter handy, I would set my ISO to 500 and the shutter speed to, lets say, 30. The reading should give me the correct aperture, yes? Thanks again!