I am not sure if this is the right place for this question, so redirect me if needed.
I am working with some vintage dry plates that probably have an ISO rating of 1, or maybe even less. My meter only goes down to ISO 3, so this got me to thinking that I may want to develop some type of conversion that I can use. Since 100 is a simple multiple of 1, I thought it may be a place to start by creating a formula to convert my ISO rating to ISO 1.
If you have any ideas, please let me know.
Thank you.
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