Anche a me sembra una risposta azzardata; però guardate cosa scrive Tamron.eu, che ritengo sia il sito ufficiale per l'Europa, a proposito dell'importazione parallela - "grey imports" - dei suoi prodotti (oltre a tutta una serie di altre affermazioni negative sulla medesima i.p.):
“ What problems could occur with grey imports?
Quality issues
Lenses are precise optical and mechanical products. We guarantee the quality of our products by ensuring correct storage, as well as by using the right types of transport and transportation partners. In the case of grey imports, there is an increased probability of improper storage or improper transport. These goods could be exposed to high temperatures, vibrations, jolts, high humidity, dust, dirt or similar negative influences. This can result in defects or malfunctions. As grey imports are not subject to strict controls, it is also possible that they are intermixed with second hand products. There have even been cases where the serial numbers on grey imported lenses have been changed so that it is difficult to recognise whether the product is new or second hand. „
www.tamron.eu/service/grey-imports/
Cari saluti.