The Sigma 10-20mm should work in LR. You might have to manually select it though. It's only below 10mm that there is any problem using lens profiles; you can use the Sigma 8-16mm profile above 10mm.

Thanks, Doug, that's a great explanation of how to do what I want with the images! I'll have a go at it! Your help is much appreciated.

That video has some good stuff in it, too, Rob, I'll have a look at darktable too, never used it before.

Interesting stuff, Doug, will have a good look at it tomorrow.

Andy, the IR conversion was done by a previous forum member. It worked really well, but no Live View. I've got a converted Sony Nex 5N now.

Whats' a BIL filter? What you're saying is a bit beyond my present comprehension, both of color spaces and of GIMP.

I've got a book on IR which has a basic method of superimposing a colour image over an IR image (a more complex variation of which was used on the previous image I linked to), blurring the colour layer using Surface Blur in Photoshop and then blending it with the IR image. By using blur, the exact lining up of the images is not so critical.

I used this simpler method (using sRGB) on another image made from an IR shot from a converted K20D and an image from my K5 link using sRGB, but as you can see the image is a bit blurry and was a bit pointless beyond the experiment itself.

Thanks Rob, Doug and Andy, that's given me lots of stuff to look at. I think I can do all I want in Gimp, it's working out exactly how to do it. Basically I'm trying to insert information from IR images into normal images, or alternatively information from colour images into IR images.. From what I've read, HSV is the best colour space for doing it.

This gives a good explanation of what I'm messing around with, and why link Ideally I'd like to be able to do it with aerial shots, and have a few ideas of how to do it using blurred colour layers (I actually managed an image of sorts last year link , using YCbCr and images from two different cameras) but am mainly going to do it on ground shots on the K3. I may also get my K5 converted to full spectrum and mess around with different combinations of filters.

Modify>Exif:LensInfo from MakerNotes doesn't work. I've found the only way to make it work is to select all images that don't have a focal length recorded and edit them all at once by changing the focal length to 8mm. Of course, some of them could have been taken at 9mm.

A bit of a long shot, perhaps, but does anyone know where I can find a good tutorial on GIMP? More specifically, I want to find out how to extract the luminance channel from an HSV image and paste it into another image? I found something online, but can't understand it at all, as everything to do with GIMP seems to written in Linugeek.

When I decompose an image to HSV with 3 layers, I can't find the Luminance channel, only Hue, Saturation and Value as Layers, or Gray and Alpha as channels. Am I right in thinking that Value layer is the same as the Luminance channel in an sRGB image? If so, any idea how to replace this layer/channel with one from another image?

Done manually by selecting all the images reading focal length 0mm in one go and changing them to 8mm......both LR and DXO profiles now work.

Thanks for the heads up on the program, Karel!

Actually, just finished processing them and after checking them again it didn't work after all, all the images below 10mm say 0mm.....