PT Lens is cheap if not free. There are a number of them out there that correct lens distortion. I haven't really a need for such wide angle in the near future so I haven't invested that much time into the subject.
As a counterpoint to my arguement against the 12-24 for people, I do know that the 12-24 has its place for wedding photographers that go to extremes to get the entire participants into one photo. I guess it is better than de-fishing a 10.5DX, which some photographers I talk to have resorted to doing.
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Lens Speed Enables.
http://www.pbase.com/seijikamiya/seiji_kamiya
As a counterpoint to my arguement against the 12-24 for people, I do know that the 12-24 has its place for wedding photographers that go to extremes to get the entire participants into one photo. I guess it is better than de-fishing a 10.5DX, which some photographers I talk to have resorted to doing.
--
Lens Speed Enables.
http://www.pbase.com/seijikamiya/seiji_kamiya