Exif -- lens reporting incorrect data |
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JosR ![]() Groupie ![]() Joined: 21 August 2007 Country: Netherlands Location: Netherlands Status: Offline Posts: 109 |
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I tested on the A580 with Sigma 10-20mm F3.5 EX DC HSM at 10mm, 15mm and 20mm focal length:
==> at 20 mm, Exiftool Composite can not positively identify the Sigma 10-20mm F3.5 |
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ILCA-77M2 + SAL1680Z, SAL70300G, SAL70400G2, Minolta 100mm Macro, ILCE-7RM4 + SEL24105G, SEL100400GM, LA-EA5
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robertsmx ![]() Senior Member ![]() Joined: 03 January 2012 Country: United States Location: Dallas, TX Status: Offline Posts: 493 |
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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. |
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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 ![]() Senior Member ![]() Joined: 30 January 2007 Country: United States Location: Texas Status: Offline Posts: 3069 |
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I does. composite tags
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JosR ![]() Groupie ![]() Joined: 21 August 2007 Country: Netherlands Location: Netherlands Status: Offline Posts: 109 |
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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 |
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ILCA-77M2 + SAL1680Z, SAL70300G, SAL70400G2, Minolta 100mm Macro, ILCE-7RM4 + SEL24105G, SEL100400GM, LA-EA5
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treaves ![]() Newbie ![]() Joined: 20 June 2012 Status: Offline Posts: 3 |
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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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robertsmx ![]() Senior Member ![]() Joined: 03 January 2012 Country: United States Location: Dallas, TX Status: Offline Posts: 493 |
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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.
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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 ![]() Senior Member ![]() Joined: 27 August 2006 Country: United States Location: United States Status: Offline Posts: 2934 |
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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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GrahamB ![]() Senior Member ![]() Joined: 13 October 2007 Country: United States Location: Eastern NC Status: Offline Posts: 1465 |
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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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Bob Maddison ![]() Senior Member ![]() Joined: 28 April 2011 Country: United Kingdom Location: Dorset Status: Offline Posts: 1102 |
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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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brettania ![]() Admin Group ![]() Dyxum factotum Joined: 17 July 2005 Country: New Zealand Location: Auckland Status: Offline Posts: 20649 |
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The prize goes to this man. |
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mhohner ![]() Senior Member ![]() Joined: 14 October 2006 Country: Germany Status: Offline Posts: 1724 |
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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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Sony/Minolta F.A.Q., bodies, lenses, flashes.
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GrahamB ![]() Senior Member ![]() Joined: 13 October 2007 Country: United States Location: Eastern NC Status: Offline Posts: 1465 |
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But that would only be a problem for jpeg shooters? Graham |
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mhohner ![]() Senior Member ![]() Joined: 14 October 2006 Country: Germany Status: Offline Posts: 1724 |
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I'm not sure. You'd have to test that. |
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Sony/Minolta F.A.Q., bodies, lenses, flashes.
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robertsmx ![]() Senior Member ![]() Joined: 03 January 2012 Country: United States Location: Dallas, TX Status: Offline Posts: 493 |
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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?).
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 |
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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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