That's certainly good news for a lot of Canon shooters. Obviously us Nikon users have had the luxury of a good fisheye for DX format for a wee while. The 4.5 does sound interesting, although I tend to prefer full frame fisheye images rather than circular ones.
My only concern would be the CA, as sigma lenses do tend to suffer from this in general, and it'll be worse with the fisheyes. _________________ Hamish
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