Dave wrote:
for the price I'd get the newer model which has supposedly improved coating to meet the demands of digital.
Actually, this is a newer "Di" (digital) designated lens, with updated coatings from the earlier LD version:
http://www.tamron.com/lenses/prod/70300_di_a017.asp While not specific for digital use, since it works on full frame bodies too (but I don't see that as bad)... otherwise, it's the same element configuration of the older LD from diagrams I've seen. And coincidentally, the same design/configuration as the lower priced Nikon Branded zoom of it's size, which retails for more.
This brings up a good point for discussing ...
I think most everyone agrees, upgrading lenses is more expensive in the long run. Plus, as Dave points out, it may be best to learn using whats available first. But sometimes it's
too restricting.
If you're subject of interest are birds, or insects it's extremely difficult to make do with standard focal lengths. Primary reason I like recommending the Tamron is to keep price to a minimum while getting usable results for varied subjects. There may be better lenses of the same length (though I personally haven't used one, which wasn't triple the price), but why spend extra which could go toward your final lens? If you're buying a "get me by", go for the least expensive, usable lens possible. And only purchase a couple of additional focal lengths at most.
This brings to mind the EF 50mm 1.8II. Excellent for the money as said, but it's limited in angle of view, even with full frame bodies. So saving for a wider angle is worth the wait if needed for inside. Maybe someone else can recommend one.. but fast, inexpensive, wide angle primes are lenses I've yet to find. Unfortunately, theres times when "good, and good enough" just won't apply.
Enjoyable thread... thanks for jumping in Dave, this is one of my favorite subjects of discussion.
Btw, seems you should be able to sell your Tamron pretty easily. They still go for around $100. in good used condition.