Thanks for the link Rick, I will have a look at the charts myself and see what my
lenses do with regards to focus.
and the
lens in question is a Tokina not a
Tamron.
Anyway on with some help.
First off I have the Tokina 11-16mm f/2.8 and love it.
As I cant see from the photo any exif data, I have no idea of the
aperture you used, but I have found f/8 and f/11 to be the two best apertures to use for landscape shots, I do use f/9 as well,
and like you usually focus 1/3 into the shot.
But like Rick has said it might pay to see if the
lens is front focusing or back focusing, especially if your using the
aperture range of f/8-f/11.
I hope this helps.