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Originally Posted by bmussatti
Here is an article I found on the internet regarding you question:
......In conclusion: are the S100 and P21s the same, but just tinted differently? Maybe. Only the German manufacturers know. But until I can find someone who can do some real scientific testing, I can't prove anything. But my educated guess is that there IS a difference.
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Thank you bmussatti! I guess I will try S100 first, coz better value and more durable.