De-Fishing Software

Can anyone recommend some free software that can be used to de-fish pictures taken with a fisheye lens?

I have a Pentax-F 17-28mm so on K10D the fisheye effect is reduced but still noticeable. From what I can tell, at 17mm it seems to equate to about 14-15mm rectilinear which would be a nice rectilinear wideangle option to have without needing to buy a new lens.

I am planning to use it with a 35mm film SLR also at some point and would like to have the option of de-fishing scans from that when I get round to it.

Richard,
Panorama Tools is a nice free tool that can defish:
http://panotools.sourceforge.net/

The UI is rather mathematical - but because of that, very reproducible!
This Wiki may be helpful as well - http://wiki.panotools.org/Special_issues_with_fisheye_lenses

Enjoy!
Matt

I would recommend that you seriously consider PTLens: http://www.epaperpress.com/ptlens/index.html.

I know it's not free, but it's worth every penny of the $25 licence fee as it can also correct the various distortions present in rectilinear lenses as well.

Richard

In the world of low-cost software, I'd recommend the Proxel Lens Corrector rather than PTLens as it does a much better job of fisheye correction IMHO.

The guy who wrote it is also a Pentax user

R

Ah yes! The Proxel one is very nice - thanks for the reminder on that!!
Matt

It's very nice, but it's only available as a PS plug-in, PTLens is both free standing and plug-in which may be important to the user, not everyone has Photoshop.