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Bug #895

Sigma 30mm f/1.4 on Canon not detected correctly

Added by Christian Roumano about 6 years ago. Updated almost 6 years ago.

Status:
Closed
Priority:
Normal
Category:
metadata
Target version:
Start date:
18 Mar 2013
Due date:
27 Apr 2013
% Done:

100%

Estimated time:
1.00 h

Description

Hi,
The Sigma 30mm 1.4 is not recogize correctly (tested with the last exiv2 version) :

exiv2 -pt 1.JPG |grep -i lens
Exif.CanonCs.LensType Short 1 Sigma 15-30mm f/3.5-4.5 EX DG Aspherical
Exif.CanonCs.Lens Short 3 30.0 mm
Exif.Canon.LensModel Ascii 70 30mm

exiftool 1.JPG |grep "Lens ID"
Lens ID : Sigma 30mm f/1.4 EX DC HSM

Information in at canonmn.cpp in the Exiv2 codebase:

{ 169, "Canon EF 17-35mm f/2.8L" 
}, // 0 { 169, "Sigma 18-200mm f/3.5-6.3 DC OS"
}, // 1 { 169, "Sigma 15-30mm f/3.5-4.5 EX DG Aspherical"
}, // 2 { 169, "Sigma 18-50mm f/2.8 Macro"
}, // 3 { 169, "Sigma 50mm f/1.4 EX DG HSM"
}, // 4 { 169, "Sigma 85mm f/1.4 EX DG HSM"
}, // 5 { 169, "Sigma 30mm f/1.4 EX DC HSM"
}, // 6 { 169, "Sigma 35mm f/1.4 DG HSM"
}, // 7

So the 169 ID is used 8 times, once by Canon (expected), and seven
times by Sigma (wtf were they thinking)...

Exiv2 uses a heuristic to match conflicted lens id's to
names using their focal length's... but it's failing here somehow...

The Bug #854 as the same issue with another lens. ( Sigma 50mm f/1.4 EX DG HSM )


Files

1.JPG (4.7 MB) 1.JPG a exemple of picture with the sigma 30mm 1.4 Christian Roumano, 18 Mar 2013 12:04

Associated revisions

Revision 3023 (diff)
Added by Niels Kristian Bech Jensen about 6 years ago

Issues #854 and #895: Improve the heuristic for matching Canon lenses by including maximum aperture. Patch by Aakash Goenka. Make all lens names unique.

History

#1

Updated by Aakash Goenka about 6 years ago

I have submitted a patch for Bug #854. It fixes this bug too.

#2

Updated by Niels Kristian Bech Jensen about 6 years ago

  • Due date set to 27 Apr 2013
  • Status changed from New to Resolved
  • Assignee set to Niels Kristian Bech Jensen
  • Target version set to 0.24
#3

Updated by Niels Kristian Bech Jensen about 6 years ago

  • Category set to metadata
  • % Done changed from 0 to 100
#4

Updated by Robin Mills almost 6 years ago

  • Status changed from Resolved to Closed

Fixed in 0.24.

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