>What I'm saying is the second shot give me the equivelant of >an 8mm lens ONLY IN TERMS OF FOV.
Yes, that's what I thought you meant - you're getting a field of view that is about what you would get on DX from a lens slightly wider than 10mm. And as I suspected there is a little darkening in the corners.
>Another trick I use in this configuration.... faking a >circular fisheye effect. Take the same frame, but in portrait >orientation. Combine them in post to simulate the >fisheye..... but without the field curvature.
If you don't have the field curvature, it's not a fisheye effect - just a circular super-wide image