Agreed.pakodominguez wrote:This statement is a little simplistic. A lens is not just a group of optics. Coating have an impact in final IQ result, and barrel construction and gearing can transform the "merely" same optic in a totally different product. We can not tell yet about how good or bad the SAM version will age,
Well, sometimes companies offer long warranties, not because the products are necessarily inferior, but because they are not market leaders so have to offer more inducements to potential customers.pakodominguez wrote:but there is a reason Tamron have to offer 6 years warranty on their lenses.