Hello- I have a Canon 814 xl-s and I will be shooting a darker, interior scene using Vision 3 500T. I understand the Canon 814 xl-s can accept and recognize films up to 400 ASA. I have further read that Kodak notches its 500T at 400ASA, so according to this, I will not need to use any kind of external light meter and can use the internal exposure meter. Wondering if anyone can verify this for me? Also, the Canon has a variable shutter and I would like to keep it at 220 because I feel it gives a sharper image, but have the ability to go to 150 if necessary. Thank you.