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I'd forget about the lens Davo - I don't know if you're talking about lens or chip size. We don't use a lens whether it's the 840 or 900.
Afaik, the "6mm" is just a guide for people when they ask "what magnification is the ToUcam". I'm sure there's a formula to work it out (Bird may know it). It might even depend on the focal length of your scope.
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