When is 50mm NOT 50mm?

Sony is quoting the "actual" (35mm) focal length of 50mm (= 75mm equivalent field of view), 35mm (= 52.5mm equiv.) etc. It's confusing at first, but makes sense.

[edit:] The focal length of a lens is valid for a 35mm Full-Frame sized sensor/film. On the smaller APS-C sensor in the NEX (& most DSLRs/SLTs), less of the image circle of the lens gets recorded, reducing its field of view by a factor of x 1.5. Think of it as cutting a chunk off around the original image e.g. 50mm gets cropped down to a 75mm view (although its perspective doesn't change to a true 75mm view).

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Regards,
Alan
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