#87 Canon FDn 200mm F4 new lens data

[COMPUTERFREAKED]

Attached are the corrections I calculated using calibrate.py. It seems the lens is quite affected by LCA at F4 but there is nothing we can do here.

The Canon FD(n) lenses seem to have a bit of a naming issue in Lensfun. Some are called "Canon Lens FDn" others simply "Canon FDn". Currently there are only 3 listed as far as I can see:

• Canon Lens FDn 24mm 1:2.8
• Canon FDn 50mm 1:1.4
• Canon Lens FDn 50mm 1:1.8

I think the word Lens doesn't add anything here. There is no EXIF match possible since all FD(n) lenses have no electronic contacts for EXIF info as far as I know so the <model> tags can be anything you want. I therefore took the liberty of naming it Canon FDn 200mm 1:4.</model>

[COMPUTERFREAKED]

I have the feeling there is something odd about the vignetting corrections. For each different apperture calibrate.py comes up with the same corrections. This should not be the case correct?

[COMPUTERFREAKED]

OK i figured it out. Calibrate.py leaves a few files, probably to avoid recalculating. Since this is a lens without exiv data I have to do the vignetting file by file since otherwise I don't know which vignetting line is which apperture. Therefore I recalulcate a lot and didn't notice this in the beginning.

I will perform the vignetting corrections again and will come back to you!

[COMPUTERFREAKED]

Attached the new corrections. Greetings ;)

[Torsten Bronger]

Thank you, I included your data and normalised the Canon FDn names!