From the Sony site:
"Thanks to its clever retracting mechanism, this zoom lens collapses to just 3/16"
From the specs page:
Dimensions (Max. Diameter x Length) : 2-5/8" x 1-13/16 (64.7 x 29.9mm)
2-5/8" is actually = 66.675mm, not 64.7mm
1-13/16" is actaully = 46.03mm not 29.9mm
I wonder which dimensions are correct, the metric or imperial.
Not sure I'd buy a lens from a company which can't convert between the two.