Just rediscovered this tool, which converts my Sigma 15mm fisheye into an ultra-wide rectilinear lens (without the barrel distortion), suitable for street shooting. Have to REALLY get close to the subject, though...
Here's the url:
http://home.no.net/dmaurer/~dersch/Index.htm
Here's the url:
http://home.no.net/dmaurer/~dersch/Index.htm