Lens misidentified in EXIF

gebco · 06-03-2012, 07:26 PM

Not sure if this is a LR3 error or an error with my K-x, but I just noticed that some photos I PPed with LR3 show the lens as the Sigma 70-200 whereas in reality it is the Sigma 50-150.
Thoughts?

**boriscleto** · 06-03-2012, 07:30 PM

Try checking the file with PhotoMe or ExifTool.

Adam · 06-03-2012, 07:35 PM

You might need to update its internal library. It could also be the case that this particular lens identifies itself ambigiously (for the software at least).

**jatrax** · 06-03-2012, 07:44 PM

Third party manufacturers have used the same Lens ID code for multiple lenses in the past. This is probably the problem. I believe the lens includes only an ID code, not the actual description and the software (Lightroom) or whatever else you use is responsible for translating that from the EXIF into the text description. A lot of Pentax lenses were miss-identified in Lightroom through version 3.5 or 3.6. So it could be that the lenses are using the same ID code or Lightroom may have the same text for more than one code.

Try looking at the jpeg with Irfanview or Photome and look at the data, does it appear correctly there?

gebco · 06-03-2012, 07:55 PM

Still showing the wrong lens, even though PhotoME tried twice

[PhotoME]
PhotoME version: 0.79R17 (Build 856)
[Overview]
File name: F:\DCIM\101_0530\IMGP6013.JPG
File type: JPEG
File size: 5 819,1 KB
Creation date: 2012-05-30 21:13
Last modification: 2012-05-30 21:13
Make: PENTAX (Global Site | PENTAX RICOH IMAGING)
Camera: PENTAX K-x
Lens: SIGMA 70-200mm F2.8 Macro or SIGMA 150-500mm F5-6.3
Software: K-x Ver 1.01
Dimension: 4288 x 2848 px (12.2 MP, 3:2)
Focal length: 68 mm (equiv. 102 mm)
Aperture: F2.8
Exposure time: 1/640" (-0.3 EV)
ISO speed rating: 3200/36°
Program: Aperture Priority
Metering Mode: Pattern
White Balance: Auto
Focus Mode: AF-S
Image Stabilizer: not stabilized
Noise Reduction: Off
Flash: Flash did not fire, compulsory flash mode

elliott · 06-03-2012, 08:00 PM

If it is reporting the actual focal length properly I wouldn't worry too much about it, I'd assume it is because the 70-200mm should never be at 68mm.

twitch · 06-03-2012, 08:16 PM

Sigma lenses are not 100% K-mount compliant (or whatever the right term is). This is not a Pentax or a Lightroom problem, it is a Sigma problem and a symptom of them reverse engineering it's lenses to be k-mount.

manacho2005 · 06-03-2012, 09:49 PM

My Sigma 18-50 F2.8-4.5 OS HSM shows up as a 70-200 F2.8 Macro HSM II. Doesn't really matter unless I attempt auto lens correction in PP.

StephenHampshire · 06-07-2012, 02:30 AM

Originally posted by gebco

Not sure if this is a LR3 error or an error with my K-x, but I just noticed that some photos I PPed with LR3 show the lens as the Sigma 70-200 whereas in reality it is the Sigma 50-150.
Thoughts?

Mine does that too, (k20,k5 bodies)not really a massive problem as all other exif correct

**Rondec** · 06-07-2012, 03:53 AM

The issue is what was mentioned above. Each lens is assigned an identifying number by its maker. In this case, Sigma assigned the same number to their 70-200 and 50-150 lenses. Photo software will just pick one of those two lenses. Sigma has done this with other lenses -- I think the 17-70 shares a number with one of their other lenses. Anyway, nothing you can do about it as far as I know.

06-03-2012, 07:26 PM	#1
gebco Veteran Member Join Date: Mar 2010 Location: Winnipeg Photos: Gallery \| Albums Posts: 329	Lens misidentified in EXIF Not sure if this is a LR3 error or an error with my K-x, but I just noticed that some photos I PPed with LR3 show the lens as the Sigma 70-200 whereas in reality it is the Sigma 50-150. Thoughts?

06-03-2012, 07:55 PM	#5
gebco Veteran Member Join Date: Mar 2010 Location: Winnipeg Photos: Gallery \| Albums Posts: 329 Original Poster	Using PhotoME: Still showing the wrong lens, even though PhotoME tried twice [PhotoME] PhotoME version: 0.79R17 (Build 856) [Overview] File name: F:\DCIM\101_0530\IMGP6013.JPG File type: JPEG File size: 5 819,1 KB Creation date: 2012-05-30 21:13 Last modification: 2012-05-30 21:13 Make: PENTAX (Global Site \| PENTAX RICOH IMAGING) Camera: PENTAX K-x Lens: SIGMA 70-200mm F2.8 Macro or SIGMA 150-500mm F5-6.3 Software: K-x Ver 1.01 Dimension: 4288 x 2848 px (12.2 MP, 3:2) Focal length: 68 mm (equiv. 102 mm) Aperture: F2.8 Exposure time: 1/640" (-0.3 EV) ISO speed rating: 3200/36° Program: Aperture Priority Metering Mode: Pattern White Balance: Auto Focus Mode: AF-S Image Stabilizer: not stabilized Noise Reduction: Off Flash: Flash did not fire, compulsory flash mode

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06-03-2012, 07:30 PM	#2
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	Try checking the file with PhotoMe or ExifTool.

06-03-2012, 07:35 PM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	You might need to update its internal library. It could also be the case that this particular lens identifies itself ambigiously (for the software at least).

06-03-2012, 07:44 PM	#4
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Third party manufacturers have used the same Lens ID code for multiple lenses in the past. This is probably the problem. I believe the lens includes only an ID code, not the actual description and the software (Lightroom) or whatever else you use is responsible for translating that from the EXIF into the text description. A lot of Pentax lenses were miss-identified in Lightroom through version 3.5 or 3.6. So it could be that the lenses are using the same ID code or Lightroom may have the same text for more than one code. Try looking at the jpeg with Irfanview or Photome and look at the data, does it appear correctly there?

06-03-2012, 08:00 PM	#6
elliott Inactive Account Join Date: Dec 2008 Location: North Carolina Photos: Albums Posts: 1,720	If it is reporting the actual focal length properly I wouldn't worry too much about it, I'd assume it is because the 70-200mm should never be at 68mm.

06-03-2012, 08:16 PM	#7
twitch Veteran Member Join Date: Nov 2009 Posts: 4,571	Sigma lenses are not 100% K-mount compliant (or whatever the right term is). This is not a Pentax or a Lightroom problem, it is a Sigma problem and a symptom of them reverse engineering it's lenses to be k-mount.

06-03-2012, 09:49 PM	#8
manacho2005 Veteran Member Join Date: Oct 2011 Location: Red Oak, TX Photos: Gallery \| Albums Posts: 462	My Sigma 18-50 F2.8-4.5 OS HSM shows up as a 70-200 F2.8 Macro HSM II. Doesn't really matter unless I attempt auto lens correction in PP.

06-07-2012, 02:30 AM	#9
StephenHampshire Veteran Member Join Date: Oct 2009 Location: Winchester Photos: Gallery \| Albums Posts: 2,523	Originally posted by gebco Not sure if this is a LR3 error or an error with my K-x, but I just noticed that some photos I PPed with LR3 show the lens as the Sigma 70-200 whereas in reality it is the Sigma 50-150. Thoughts? Mine does that too, (k20,k5 bodies)not really a massive problem as all other exif correct

06-07-2012, 03:53 AM	#10
Rondec Loyal Site Supporter Join Date: Mar 2009 Location: Gladys, Virginia Photos: Gallery Posts: 27,663	The issue is what was mentioned above. Each lens is assigned an identifying number by its maker. In this case, Sigma assigned the same number to their 70-200 and 50-150 lenses. Photo software will just pick one of those two lenses. Sigma has done this with other lenses -- I think the 17-70 shares a number with one of their other lenses. Anyway, nothing you can do about it as far as I know.