What are the relationships between ASA, ISO, and DIN?
ASA and DIN speeds are determined using the same measuring methods but are expressed differently. DIN is a logarithmic expression while ASA is an arithmetic one. Think of the ISO speed of a film as combination of ASA and DIN. ASA and DIN are old terms are I think you will see them slip more and more out of use. In short, shoot a your ASA 200 film the same way you would an ISO 200 film and your results should be pretty close.
