The Sigma 8 is a full circle fisheye, and the left and right side of the circle are sensor sized cropped, hence 4 shot drum type images.
The Canon 20d with the Sigma 8 uses 4 'Drum' images at 90 with no T&B. The bottom tripod cap is the glass sphere (PS action). And there is a small pin hole at the zenith top.. which I fix in PS.
20d and 350d have the same sized 8mp sensor. Both cameras use the same lens. Here in the US the 350d black body is marketed as the new Rebel XT. The older Rebel is only 6mp.
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EasyPano - Panoweaver