How do you know ISO 100 is really ISO 100?
I can also see the question for film....How do you really know that 100 speed film is truly 100 speed film? Just like is 100 ISO truly 100 ISO?
Why is ketchup, ketchup?
Why is a cow a cow and not a pig?
The only thing we do know is the world is round. lol
cwightmanphotos wrote: That is a good question.
I can also see the question for film....How do you really know that 100 speed film is truly 100 speed film? Just like is 100 ISO truly 100 ISO?
Why is ketchup, ketchup?
Why is a cow a cow and not a pig?
The only thing we do know is the world is round. lol
Actually!
Depending on whos film you were using some were indeed different. I have had some minor diffrences in how the film exposed using the sunny 16 rule to test them. 
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