It's a lens problem. IIRC Sig[nificant} Ma[lfunctions] does not license lens data from any manufacture and reverse engineers everything so there are often conflicts between firmware in later Non Sigma cameras and earlier Sigma lenses. I think sigma offers an update service, but I could be wrong about that. These problems used to be so prevalent that there was a web site dedicated to them, it was sometimes fun to read, but seems to have disappeared a few years ago. I haven't cared enough to see if it was saved by the Wayback Machine.

On 6/7/2013 6:39 AM, Jos from Holland wrote:
Dear group,
I aquired the Sigma 8-16mm lens for use on my K5.
I noticed that the camera does not show any lens name in the metadata info in Lightroom (version 4.4) and the focal length is only mentioned down to 10 mm, 9 and 8 is blank.
Camera SW version is 1.14, (the latest)
Is this a camera problem or a Lightroom problem?

Greetz, Jos



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