BeenThere said:
Based to a large extent on Dustin's early review I purchased the new Tamron. One of my interests is night photography and the night shots from Dustin's review looked promising. I was specifically interested in the Coma performance wide open and did some comparisons with a few other wide angle lenses to see how the new Tamron faired. Bottom line was that it did very well in the comparisons. Perhaps my new favorite starry night lens. My results are posted here:
http://www.ronbrunsvold.com/tools/wide-angle-lenses-for-night.html
Ron, with your permission I would like to link to your findings in my upcoming three way shootout. You've given more time to this than what I will have time to do.
Dustin
I don't have any problem with you linking to my findings. As far as infinity focus goes, when testing, I almost always use live view to find infinity and it is hardly ever exactly at the hard stop or infinity mark. Even the Zeiss 21 mm Distagon that i tested wasn't quite at the hard stop though it was very close.
Ron
P.S. My single greatest challenge with shooting nightscapes with the 16-35mm f/4L IS has been because infinity focus (manually) isn't calibrated properly. You can focus beyond infinity, and as a result get blurry results. This has been true on both copies I've used thus far. With familiarity I would find the proper place to focus, but sometimes during the length of time that I have lenses I don't always get an opportunity to spend a lot of time figuring that out. The Tamron 15-30 was much easier - I just twisted the dial to infinity, went out and shot, and got great results.