Canon adorns each of their lens with a ring of some sort. L series lenes get the lauded red ring, while DO lenses get the Green ring. Then we come to the consumer lenses, which get the silver and gold rings. Used to, the entry level lenses got the silver rings (18-55, etc), while the high end consumer lenses got the gold rings (such as 17-55). But with the recent lens additions, things seem to be out of order. For example, the recently announced EF-S 15-85 is getting a silver ring, but is priced above alot of gold ring lenses (such as 28-135, EF-S 10-22) and even some L lenses (17-40). Can someone elaborate on ranking of the color of rings on lenses? I thought I had it understood but I'm guessing I dont.