I just received a camera guide booklet to use with my 1947 Zeiss Ikonta. Publication date on the booklet is 1957. Inside are the film types listed to use. In using these older cameras and referencing the old information that comes with them is there a cross reference on films that will take me from old to new by both brand and/or speed type? I know that in my 18 yrs as a mechanic, I would replace part A with updated part B or C after being that this was the way to go. I guess that I am trying to find the same thing here with film to use. I suppose I could go by trial and error but I would rather have some established information to save me some time and I don't want to reinvent the wheel( if you know what I mean). I appreciate the info that I find here and say a big Thank You to everyone here.