I have read things on this lens and keep hearing people say that there are two versions of this one but no one is really sure? I'm wondering if anyone knows anything about this? And what ever happend to the af 28-70mm f3.5-4D? This lens was suppose to be superior over the new plastic mount unit. I don't see it listed on the NikonUSA site, was it discontinued?
I don't know if the earlier (7 element) version has a plastic mount but I would assume it does because it is plastic on the newer one. The earlier lens can be identified by its very narrow focusing collar with a single row diamond grip surface near the front of the barrel. The newer lens has a much wider focusing collar, I'd say about 3/8", and has a notched grip area embossed into the plastic. You can see a picture of the newer lens on B&H Photo's website, www.bhphotovideo.com.