On Wed, Mar 6, 2013 at 7:47 AM, Russell Edwards <[email protected]> wrote:
> Hi,
>
> I was just fiddling with lens correction on an image taken with my
> Pentax K5II and a Samyang 14mm/2.8 lens.
>
> In the lens correction module it comes up with "Pentax K-5 II" for the
> camera, and "A Series Lens" for the lens, and applies no noticeable
> distortion corrections.
>
> If I change the camera to another Pentax APS-C camera (or a Generic
> 1.5x camera), suddenly it applies a pretty good pincushion correction.
>
> How can this be, when darktable has apparently not identified my lens?
>
> This lens does not communicate electronically with the camera. I told
> the camera the focal length was 15mm (as it has no 14mm option) and this
> is reflected in the exif data. Has darktable somehow just made a
> reasonable guess at how much pincushion a 15mm lens on APS-C will have
> ??
>
> I will make the effort to calibrate the lens and submit it to LensFun
> but I am just curious what's going on here and where darktable is
> getting its correction parameters from in this instance. I am using
> darktable 1.1+1175~g2434bf0.
>
> Secondly it won't let me choose any other lens unless I select a camera
> other than the automatic "Pentax K-5 II".
The base problem you're likely having is the missing camera definition
for the K-5 II... I've attached an file you can locally place in
~/.local/share/lensfun
If that works for you, please do report it (and the fact that you
tested it), to the lensfun project, so it can be included.
Regards,
Pascal de Bruijn
<lensdatabase>
<camera>
<maker>PENTAX</maker>
<maker lang="en">Pentax</maker>
<model>PENTAX K-5 II</model>
<model lang="en">K-5 II</model>
<mount>Pentax KAF2</mount>
<cropfactor>1.5</cropfactor>
</camera>
<camera>
<maker>PENTAX</maker>
<maker lang="en">Pentax</maker>
<model>PENTAX K-5 II s</model>
<model lang="en">K-5 II s</model>
<mount>Pentax KAF2</mount>
<cropfactor>1.5</cropfactor>
</camera>
</lensdatabase>
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