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Greenwing,
The EXIF data tells me, and always has told me that the lens's extremes were 18mm and 70mm. On that basis alone I have never had any reason to doubt them as I have never directly compared this lens to similar optics. I feel pretty sure that very few owners and users have either - and that might well include lens testers from publications as well.
As Stephen Batey rightly points out a 1mm difference is hardly worth anyone's concern so 17mm or 18mm probably would not get noticed. However 50mm against 70mm is somewhat more extreme. Either all 18-70 Nikkors are in fact 17-50mm and everybody's been duped, or I have a rogue.
Without input from a 18-70mm lens owner, I'll never know.
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