Nice job, it's a fun lens! Definitely try playing with it a bit more. It's great when you get close up to objects/subjects as well as playing with composition. Since my screen is so small (netbook, traveling right now) I noticed that your horizon is right in the middle of each photo. Especially at 10mm, you can REALLY 'grab' the sky (or the ground!) if you shift the horizon up or down.
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