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Exif -- lens reporting incorrect data

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JosR View Drop Down
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Post Options Post Options   Quote JosR Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2012 at 21:11
Originally posted by analytical analytical wrote:

I wonder what exiftool gets for composite lens id for the sigma 10-20 or 18-250 lenses mentioned on this thread?

I tested on the A580 with Sigma 10-20mm F3.5 EX DC HSM at 10mm, 15mm and 20mm focal length:

======== A580_03224.JPG
[IFD0]          Camera Model Name               : DSLR-A580
[ExifIFD]       Max Aperture Value              : 3.5
[ExifIFD]       Focal Length                    : 10.0 mm
[ExifIFD]       Lens Info                      : 10 20 3.5 3.5
[ExifIFD]       Lens Model                      : 10-20mm F3.5
[Sony]          Lens Type                      : 128
[Sony]          Lens Type                      : Tamron or Sigma Lens (128)
[Sony]          Lens Spec                      : 00 10 20 3.5 0 00
[Sony]          Lens Spec                      : 10-20mm F3.5
[Composite]     Lens ID                         : Sigma 10-20mm F3.5 EX DC HSM
======== A580_03225.JPG
[IFD0]          Camera Model Name               : DSLR-A580
[ExifIFD]       Max Aperture Value              : 3.5
[ExifIFD]       Focal Length                    : 15.0 mm
[Sony]          Lens Type                      : 128
[Sony]          Lens Spec                      : 10-20mm F3.5
[Composite]     Lens ID                         : Sigma 10-20mm F3.5 EX DC HSM
======== A580_03227.JPG
[IFD0]          Camera Model Name               : DSLR-A580
[ExifIFD]       Max Aperture Value              : 3.5
[ExifIFD]       Focal Length                    : 20.0 mm
[Sony]          Lens Type                      : 128
[Sony]          Lens Spec                      : 10-20mm F3.5
[Composite]     Lens ID                         : Tamron 18-200mm F3.5-6.3 or Sigma 10-20mm F3.5 EX DC HSM

==> at 20 mm, Exiftool Composite can not positively identify the Sigma 10-20mm F3.5


ILCA-77M2 + SAL1680Z, SAL70300G, SAL70400G2, Minolta 100mm Macro, ILCE-7RM4 + SEL24105G, SEL100400GM, LA-EA5
 



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robertsmx View Drop Down
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Post Options Post Options   Quote robertsmx Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2012 at 21:27
Originally posted by JosR JosR wrote:


==> at 20 mm, Exiftool Composite can not positively identify the Sigma 10-20mm F3.5

That is interesting, considering that it is also the only one of three focal lengths you picked for test that has an overlap between the two lenses. So, EXIF Tools appears to be using focal length as an additional parameter.
A55|16-50mm SSM|18-250mm HSM|50mm 1.4|70mm 2.8 Macro|135mm 2.8 STF|200mm 2.8 HS||NEX-6|E 8mm 2.8|E 20mm 2.8|E 35mm 1.8|50mm 1.7 Planar|LA-EA2
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analytical View Drop Down
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Post Options Post Options   Quote analytical Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2012 at 00:44
I does. composite tags
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Post Options Post Options   Quote JosR Quote  Post ReplyReply Direct Link To This Post Posted: 12 March 2012 at 19:58
Originally posted by JosR JosR wrote:

I tested on the A580 with Sigma 10-20mm F3.5 EX DC HSM at 10mm, 15mm and 20mm focal length:
======== A580_03227.JPG
[IFD0]          Camera Model Name               : DSLR-A580
[ExifIFD]       Max Aperture Value              : 3.5
[ExifIFD]       Focal Length                    : 20.0 mm
[Sony]          Lens Type                      : 128
[Sony]          Lens Spec                      : 10-20mm F3.5
[Composite]     Lens ID                         : Tamron 18-200mm F3.5-6.3 or Sigma 10-20mm F3.5 EX DC HSM


==> at 20 mm, Exiftool Composite can not positively identify the Sigma 10-20mm F3.5

The latest release of Exiftool 8.81 now uses the information in LensSpec to determine Composite:LensID.

==> Now also at 20mm the Sigma 10-20mm is correctly identified:
======== A580_03227.JPG
[IFD0]          Camera Model Name               : DSLR-A580
[ExifIFD]       Max Aperture Value              : 3.5
[ExifIFD]       Focal Length                    : 20.0 mm
[Sony]          Lens Type                      : 128
[Sony]          Lens Spec                      : 10-20mm F3.5
[Composite]     Lens ID                         : Sigma 10-20mm F3.5 EX DC HSM
ILCA-77M2 + SAL1680Z, SAL70300G, SAL70400G2, Minolta 100mm Macro, ILCE-7RM4 + SEL24105G, SEL100400GM, LA-EA5
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Post Options Post Options   Quote treaves Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 02:28
I'm using a Sigma 20mm lens on my a77. When I load the image into an editing app, and look at the EXIF info, the lens is identified as a 100-300 F4.5-5.6, when it is in fact a prime 20mm F1.8.

Any idea why this is happening?
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Post Options Post Options   Quote robertsmx Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 03:42
I get the same ID for Sigma 70mm f/2.8 macro lens, so it would appear these two lenses are sending an ID that the EXIF viewer is translating as 100-300.
A55|16-50mm SSM|18-250mm HSM|50mm 1.4|70mm 2.8 Macro|135mm 2.8 STF|200mm 2.8 HS||NEX-6|E 8mm 2.8|E 20mm 2.8|E 35mm 1.8|50mm 1.7 Planar|LA-EA2
 



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momech View Drop Down
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Post Options Post Options   Quote momech Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 03:45
Sigma doesn't pay royalties to the manufacturers for their design info; they "reverse engineer" their stuff, and their lens ID data is not very consistent. They seem to feel that if the lens functions, then it doesn't matter what the camera's chip thinks about it.
Doesn't seem to be too much of a problem but I've wondered if it could cause problems with Sony's SSS which depends on proper focal length, etc., to compensate for movement properly.
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Post Options Post Options   Quote GrahamB Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 04:01
The story of Sigma not paying "royalties" is well known. I'm not sure how true the story is, as Tamron, with Sony having a significant (11.08%) ownership stake, also doesn't report the correct lens, at least with Lightroom and Photoshop.

My Tamron 90mm f/2.8 macro is reported as a 100mm f/2.8, and my 28-75 f/2.8 is reported as a 24-105 f/3.5-4.5. The correct focal length is reported once a file is selected, so I think the camera is providing the appropriate steady shot support. It seems to be only a database problem.

The only lenses that report correctly are Minolta and Sony lenses.

Graham

Edited by GrahamB - 03 July 2012 at 04:06
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Post Options Post Options   Quote Bob Maddison Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 04:33
Have you looked he EXIF information in the current EXIF tool? The information might be there but your editing software isn't recognising it.
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Post Options Post Options   Quote brettania Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 05:19
Originally posted by momech momech wrote:

Sigma doesn't pay royalties to the manufacturers for their design info; they "reverse engineer" their stuff, and their lens ID data is not very consistent. They seem to feel that if the lens functions, then it doesn't matter what the camera's chip thinks about it.
Doesn't seem to be too much of a problem...


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Post Options Post Options   Quote mhohner Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 15:44
Duplicate IDs are no problem for SteadyShot, because focal length is a separate data item, and the camera uses that for SS.

However, the camera uses the lens ID for AF adjustment and lens corrections. So when you happen to own two different lenses with the same ID, you can not adjust AF for them separately. Also, lens correction applied by the camera may make the image worse instead of better if taken with the Sigma lens.
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Post Options Post Options   Quote GrahamB Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 15:56
Originally posted by mhohner mhohner wrote:

Also, lens correction applied by the camera may make the image worse instead of better if taken with the Sigma lens.


But that would only be a problem for jpeg shooters?

Graham
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Post Options Post Options   Quote mhohner Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 16:08
Originally posted by GrahamB GrahamB wrote:

Originally posted by mhohner mhohner wrote:

Also, lens correction applied by the camera may make the image worse instead of better if taken with the Sigma lens.


But that would only be a problem for jpeg shooters?

Graham


I'm not sure. You'd have to test that.
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Post Options Post Options   Quote robertsmx Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2012 at 16:10
Lens Type Value translation (EXIF Tool):
25     = Minolta AF 100-300mm F4.5-5.6 APO (D) or Sigma Lens
25.1     = Sigma 100-300mm F4 EX (APO (D) or D IF)
25.2     = Sigma 70mm F2.8 EX DG Macro
25.3     = Sigma 20mm F1.8 EX DG Aspherical RF
25.4     = Sigma 30mm F1.4 EX DC
25.5     = Sigma 24mm F1.8 EX DG ASP Macro

Your 20mm lens should be 25.3, and my 70mm lens should be 25.2, but both Composite Lens IDs are apparently being translated as 25 for Lens ID. May be, the camera software deals with this translation differently than does EXIF Tool (in which case, micro-adjust may not be an issue?).

Originally posted by GrahamB GrahamB wrote:

But that would only be a problem for jpeg shooters?
Graham

I would think that the problem, if it exists, would apply regardless since micro-adjust is tied to Lens ID. If the camera software uses the composite value that is correctly passed by the lens, then that may not be an issue at all.

Edited by robertsmx - 03 July 2012 at 16:14
A55|16-50mm SSM|18-250mm HSM|50mm 1.4|70mm 2.8 Macro|135mm 2.8 STF|200mm 2.8 HS||NEX-6|E 8mm 2.8|E 20mm 2.8|E 35mm 1.8|50mm 1.7 Planar|LA-EA2
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