[Digikam-users] Re: Tamron lens not properly recognized

[Gilles Caulier]

yes this is the problem for Sony camera with different lens (minolta, sony,
tamron, sigma, etc...)

As i implemented Sony makernote in Exiv2, i can confirm this behavior. This
is probably the same about other camera makernotes.

I remember some thread about this subject with Andreas Huggel (Exiv2 lead
developper), to handle lens maker and other metadata to wrap better lens
description. I'm not sure if there is already a file in Exiv2 bugzilla, but
if not, a new entry must be written about it.

Gilles Caulier

2011/5/23 Remco Viëtor <remco.vietor at wanadoo.fr>

> on Monday 23 May 2011, Gilles Caulier wrote:
> > 2011/5/23 Marie-Noëlle Augendre <mnaugendre at gmail.com>
> >
> > > My new Tamron 70-300 mm F4–5,6 Di VC USD is identified as a Canon EF
> > > 28-105 mm in Digikam!
> > > I've looked at the same pictures in other programs:
> > >  - UFRaw does the same (I guess it is "normal" as they both use the
> same
> > > library?)
> > >
> >
> > Yes, Exiv2 library
> >
> >
> >
> > >  - RawTherapee calls it a 70-300 mm but from Canon!
> > > Focal length is OK.
> > >
> > > Is there a way to correct this? Or is it simply a matter for the next
> > > upgrade, or so?
> > >
> >
> > Report this problem to Exiv2 bugzilla : http://www.exiv2.org
> >
> > Gilles Caulier
>
> Well, I see usually a list of possible lenses in the makernote section of
> the
> EXIF metadata (Sony A330).
>
> This makes me suspect it's *not* an error in the Exiv2 library, but caused
> by
> duplicate identifiers provided by the lens manufacturers; i.e. the exact
> lens
> used is not registered as a string containing a description, but as an
> integer
> value, decided by the lens manufacturer (and they don't seem to be talking
> too
> much with one another).
>
> So the best you can hope for is that the authors of the Exiv2 library add
> the
> name of the (unidentified) lens you used to their lists. I'd suggest
> attaching
> a full description of your lens and a RAW image to the bug report, so they
> can
> extract the data and pick up the proper ID code.
>
> The focal length seems to be encoded separately and independently of the
> lens
> ID (and at least for me, seems correct).
>
> (to illustrate: I get 1 ID string for my Sony kit lens, 2 for my Tamron
> 90mm
> macro and 8 (yes, eight) for my 70-300 mm Sigma, and those last 8 don't
> include the exact model... All this in the makernote section of the EXIF
> metadata)
>
> Remco
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