Hello! I'm trying to implement a lens correction logic for UFRaw and I had in mind to implement something like a database for lens parameters. Of course I was very pleased to read the thread about lens correction database on this mailing list.
Is there any movement in this direction? And some comments. I would like to have the ability to save user-defined lenses somewhere in, say, ~/.lensdb/ and have the library automatically find and read them (perhaps overwriting some "stock" lens definitions). So, if there should be multi-file support, it would be better imho to split the database into multiple files, for example by maker. I'm not sure if it makes sense to split into camera makers and lens makers, perhaps e.g. canon.xml could contain both Canon cameras and Canon lenses. Having multiple files will make it easier to install additional packages that provides additional camera/lens info, they would just add new files to /usr/share/lensdb/ rather than patching one big file. The XML structure looks fine to me. However, I'm not sure if the a, b and c lens distortion parameters are the same at all crop factors? For example, suppose I take a shot with a full-frame Canon Mark II (crop factor 1) and with a Sigma SD14 (crop 1.7) with the same lens, say Sigma 30mm/F1.4 which is available for both mounts. I think the "absolute" distortion parameters will be very different, is it possible for this to be taken into account algorithmically? -- Andrew
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