Any tips for shooting with fisheye/ 10.5mm?

Hi all,

Any tips from you experienced shooters for shooting with the 10.5mm lens? I get barrel distortion at the edges. See shot below. The image after was corrected using the distort/spherize function in Photoshop CS2. How 'ethical' is this sort of post-processing for submission to competitions?

See this thread on the same subject.

About 'ethical', It's depend on the competitions rules, some will allow anything and some will allow only minimal post-processing.