Bug #938

Tamron 18-270 is not detected anymore

Added by Torsten Bronger almost 4 years ago. Updated over 2 years ago.

Status:ClosedStart date:18 Dec 2013
Priority:NormalDue date:31 Aug 2014
Assignee:Niels Kristian Bech Jensen% Done:

100%

Category:metadata
Target version:0.25

Description

With exiv2 0.23, I get:

exiv2 -pt Tamron_AF_18-270mm_f__3.5-6.3_Di_II_VC_PZD--25.0mm--4.0_IMG_7456.CR2 | grep LensType
Exif.CanonCs.LensType                        Short       1  Tamron AF 18-270mm f/3.5-6.3 Di II VC PZD

However, current SVN exiv2 yields:

exiv2 -pa Tamron_AF_18-270mm_f__3.5-6.3_Di_II_VC_PZD--25.0mm--4.0_IMG_7456.CR2 | grep LensType
Exif.CanonCs.LensType                        Short       1  137

Related issues

Related to Exiv2 - Bug #926: Lens matching on Canon Closed 13 Oct 2013 31 Aug 2014
Related to Exiv2 - Bug #927: Sigma Lens Not detected Closed 18 Oct 2013 31 Aug 2014
Related to Exiv2 - Patch #982: Improve detection of Canon lenses sharing the same IDs Closed 15 Aug 2014 31 Aug 2014

Associated revisions

Revision 3340
Added by Niels Kristian Bech Jensen about 3 years ago

Fix issue #982: Improve detection of Canon lenses sharing the same IDs. Also fixes issues #926, #927, and #938. Thanks goes to Alexander Steffen for the patch.

History

#1 Updated by Torsten Bronger almost 4 years ago

The upload of the RAW to redmine does not work. The RAW can be found here:

http://wilson.bronger.org/Tamron_AF_18-270mm_f__3.5-6.3_Di_II_VC_PZD--25.0mm--4.0_IMG_7456.CR2

#2 Updated by Niels Kristian Bech Jensen almost 4 years ago

  • Category set to metadata
  • Status changed from New to Assigned
  • Assignee set to Niels Kristian Bech Jensen
  • Target version set to 0.25

Hi Torsten.

I think it is the same problem as issue #926. Please check with an image taken with the shortest focal length (18mm). The lens should be detected correctly with that focal length.

Best regards,
Niels Kristian Bech Jensen

#3 Updated by Torsten Bronger almost 4 years ago

I uploaded an image at 18mm here: http://wilson.bronger.org/Tamron_AF_18-270mm_f__3.5-6.3_Di_II_VC_PZD--18.0mm--3.5_IMG_7454.CR2

I see the same problem here:

$ exiv2 -pt Tamron_AF_18-270mm_f__3.5-6.3_Di_II_VC_PZD--18.0mm--3.5_IMG_7454.CR2 | grep -i lens
Exif.CanonCs.LensType                        Short       1  137
Exif.CanonCs.Lens                            Short       3  18.0 - 270.0 mm
Exif.Canon.LensModel                         Ascii      70  18-270mm

#4 Updated by Niels Kristian Bech Jensen almost 4 years ago

The lens is not detected at 18mm because "Exif.CanonCs.MaxAperture" return F3.6 and not F3.5 at that focal length. The Tamron 18-250mm I once had for Nikon did the same.

Unfortunately Canon makernotes does not seem to have a tag with "max aperture at min focal length".

Best regards,
Niels Kristian Bech Jensen

#5 Updated by Niels Kristian Bech Jensen about 3 years ago

  • Due date set to 31 Aug 2014
  • Status changed from Assigned to Resolved
  • % Done changed from 0 to 100

Fixed by r3340.

Best regards,
Niels Kristian Bech Jensen

#6 Updated by Andreas Huggel over 2 years ago

  • Status changed from Resolved to Closed

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