Lies of BIG Diameter !
Many of us maybe confused with large 19, 20, 22, or even 23 mm diameter lenses stated on the bottle label out there sold by other sites. Yes, we know, all of those are from China by those irresposible suppliers with unknown source of origin and inferior quality. A common sense will tell you that a person eyes can't be that large, just use a ruler to measure 19mm and try to put close to your eyes, how could it possible fit in our eyes? Any respsosible and ethical manufacturer or supplier won't simply put that kind of exaggerated diameter size in their packaging just to woo buyers except those lenses from China ! The fact is there is NO 17.5mm, 18mm, or 19mm diameter lenses in terms of manufacturing industry standard. The largest diameter being manufacturing by manufacturers so far is 15.0 mm and nothing beyond that.
When we use 16mm or 17mm on model pictures, they are actually refer to enlargement effect (color area) but not the diameter of the lenses stated on the packaging. The diameter on the packaging itself will either be 14.0, 14.2, 14.5, 14.8 or 15.0mm which is current international industry standard.