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01-27-2017, 10:34 AM   #1
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Exif data of photos taken with 10mm F2.8 EX DC HSM Fisheye records incorrectly.

A couple of weeks ago I purchased a Sigma 10mm F2.8 EX DC HSM Fisheye for use with my K-3 II.

The Lens field within the Exif data of photos taken with the 10mm fisheye end up being filled by Sigma 70-200mm F2.8 EX DG Macro HSM II. Does anyone happen to know if this is indicative of a broader problem?

Appreciated,
Matthew

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01-27-2017, 10:41 AM   #2
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This is based on a simple numeric code, of which there aren't enough to go around. Hence some older 3rd-party lenses end up mistaken for newer ones. Fortunately, as your example shows, the focal length information does not depend on that code.
01-27-2017, 11:17 AM   #3
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You can use an EXIF editor to correct this problem. I use EXIFToolGUI which is a free program that can batch edit the information easily.
01-27-2017, 11:35 AM   #4
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Blame Sigma for using an ambiguous lens id code (passed back to the camera through the data pin on the mount face). I don't know what code is passed for your lens, but Sigma is famous for using the same code (often "8 255") for multiple lens models and for using different codes for the same lens model at different times in the product life cycle. Based on the lens name displayed in your snippet (Sigma 70-200mm F/2.8 EX DG Macro HSM II), I would guess that the id code is either "8 255" or "8 16". Both codes were used for that lens and probably for your 10mm fisheye as well.*

Out of curiosity, what software did you use to display the EXIF?

As noted above, you can overwrite the LensModel value in the EXIF using ExifTool with or without ExifToolGUI.**


Steve

* I was unable to find the code for the Sigma 10mm F2.8 EX DC HSM Fisheye, despite the usually excellent resources on the ExifTool Web site.

** ExifTool is a command-line utility available for download as Windows or MAC standalone executables from: http://www.sno.phy.queensu.ca/~phil/exiftool/ . ExifToolGUI is a graphical front-end interface to ExifTool. Links to both the executable and documentation may be found at: http://u88.n24.queensu.ca/exiftool/forum/index.php/topic,2750.0.html


Last edited by stevebrot; 01-27-2017 at 11:49 AM.
01-27-2017, 12:10 PM   #5
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QuoteOriginally posted by baro-nite Quote
This is based on a simple numeric code, of which there aren't enough to go around. Hence some older 3rd-party lenses end up mistaken for newer ones.
There are plenty of codes to go around (the code is a combination of two eight-bit unsigned integers)*. Some of the duplication is due to third-party makers wishing to spoof Pentax-brand lenses (my Sigma 50/2.8 EX DG Macro spoofs the Pentax-F 50/2.8 Macro) and some is due to unexplained sloppiness on the part of the makers. There is also potential for future confusion if Pentax duplicates codes used by third-party makers with new product. After all, Pentax "owns" the data space. At present, all Sigma lenses overlay the space for Pentax-F, Pentax-FA (partial), Pentax-DA, and Pentax-D FA lenses.

Fun, eh?


Steve

* The lookup table used by ExifTool along with a brief explanation may be found at: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Pentax.html#LensType

Last edited by stevebrot; 01-27-2017 at 12:18 PM.
01-27-2017, 02:32 PM   #6
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QuoteOriginally posted by stevebrot Quote
Out of curiosity, what software did you use to display the EXIF?
Adobe Bridge CS5.
01-27-2017, 03:08 PM   #7
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Sigma has used 8 255 for about 6 lenses. My 10-20/3.5 has an 8 255 identifier. Apparently the lens can be sent to Sigma to have it changed.

The lens id tag is a locked tag too. An EXIF editor can't change it.
01-27-2017, 04:53 PM   #8
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QuoteOriginally posted by boriscleto Quote
The lens id tag is a locked tag too. An EXIF editor can't change it.
As with all makernotes fields, this is true. That being said, the standard EXIF LensModel tag may be freely edited and will override any lens id codes in the makernotes for display purposes with Lightroom and most other software tools.


Steve

01-27-2017, 05:24 PM   #9
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I never have a Sigma lens show the correct Exif data.
01-27-2017, 06:27 PM   #10
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QuoteOriginally posted by Scorpio71GR Quote
I never have a Sigma lens show the correct Exif data.
My 150-500 has the correct identifier...
01-27-2017, 07:09 PM   #11
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QuoteOriginally posted by boriscleto Quote
My 150-500 has the correct identifier...
My 50-500 shows incorrect. My 17-50, 10-20, 50-200, 70-200, and 8-16 all showed incorrect.
01-27-2017, 07:15 PM   #12
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QuoteOriginally posted by Scorpio71GR Quote
My 50-500 shows incorrect. My 17-50, 10-20, 50-200, 70-200, and 8-16 all showed incorrect.
My theory is that it has to do with when the lens is manufactured. Early in the run gets a generic identifier...My 150-500 was purchased shortly before it was discontinued.
01-28-2017, 09:22 AM   #13
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My 24-70 HSM is shown as a 70-200 by Lightroom. Has anyone actually sent a lens to Sigma for correction?
01-28-2017, 10:07 AM   #14
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I use(d) a plugin for Lightroom 4.4 called LensTagger. It works with ExifTool to change the lens name within Lightroom. I guess this is the LensModel field but I never really cared a lot about what happened behind the scenes, just that it worked. It was still a little clumsy but here's how it worked. I could use LR to find all the images shot with a KA lens where I entered 400mm into SR. Then I opened the plugin, selected my Tokina SD 400/5.6 from a list of lenses I've entered into LensTagger, and let it run to change the files. LR has to read the metadata back from the files and that's it.

I use the past tense because I had to reinstall LR and forgot the magic locations for LR, the plugin and ExifTool to happily coexist. So I have a backlog as usual of files to organize.
01-28-2017, 10:46 AM   #15
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QuoteOriginally posted by Just1MoreDave Quote
I use(d) a plugin for Lightroom 4.4 called LensTagger.
Works great with CC. Not hard to install at all...at least on a Mac...
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