Fisheye to rectilinear conversion?

I'd like to have fisheye for coverage, however in some occasions I'd like to have straight lines when I'm assisting in archeological situations.

I imagine there are tools like PTlens which could provide correction for this. However, PTlens in particular only works with JPG and I like to do this on raw.

Suggestions?

You can convert RAW with the PS plug-in and then work in 16bit with PT Lens as PS plug-in. Or simply use the PS tool to convert from fisheye to rectilinear.