Hi all! My name is Jason. I m from Malaysia. I have just received my 500 CM yesterday. It is my first Hassey. I loaded a roll of film onto the back. Now, this is the part which left me confused. I was Told that it is not necessary to set the ISO/ASA of the film. I find it odd as I had to do that everytime I load a new roll of film with diff ASA reading into FM2n. Can someone explain to me the mechanism of the Hassey? Why it is not required to set the ASA? Thanks!~