I want to know the answer to the following question:
How did older models convert to ASA scale?
All the background I'm provided with is that "For some of the older meters with scales in "Film Speed" or "Film Value" (e.g. models DW-48, DW-49 as well as early DW-58 and GW-68 variants), replaceable hoods with ASA scales were available from the manufacturer.". Is that enough to answer the question?