Playing with the Tokina 11-16mm, should I f stop more?

[Amra]

Hi guys, I've recently bought myself a Tokina 11-16mm lens. Sadly it will not focus at infinity with my full spectrum 1100D, but I have a normal 1100D where it works just fine.

Here's a image I took tonight:

http://astrob.in/61848/

All the acquisition details are in there.

I like the results, since it's only a single 10 minute exposure and I only did white balancing in PS. I want to try to stack later & see what more can be achieved.

But should I f stop higher to get rid of the spherical aberration or try and remove it in processing?

[Amra]

Hmm to be honest I should probably just crop it out.