The ones I was talking about are both dedicated lenses.
You dont say what camera you are using but looking at your EXIF it's a D50. The reason it's not as 'distorted' as mine is because like I said the Nikon 10.5 fisheye is the only lens I know of which is full frame on a non full frame camera.
So your Sigma lens would theoretically be just the same as mine on a film camera using the full width and height of the glass - but on the smaller sensor size of your D50 it is only using the middle of the lens, so not as much distortion.
Hope I made sense there. Whilst I am getting the full 180degrees of my lens, you are not. I don't think theres much you can do about it either. The effect is still good but just not as extreme.
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