Looked at the EXIF data? I used a Tamron 18 - 250mm travel zoom. I'm not quite happy with the performance at the telephotoo range because of visible vignetting. You have to go down to F18 in order to get decent shots :-(
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe