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Exif -- lens reporting incorrect data

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twm47099 View Drop Down
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Posts: 395 		Post Options Post Options   Quote twm47099 Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2012 at 12:51
Sony maintains the database of lens IDs. They are not likely to add lenses that they do not license (and I'm not even sure if 3rd party licensed lenses show up with the third party brand name.)

tom
 



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Jozioau View Drop Down
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Posts: 10438 		Post Options Post Options   Quote Jozioau Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2012 at 13:01
@Fuzzphoto:
My point is that I expected accurate EXIF data to be automatically attached to images, whether taken by me or others.
I have communicated this error to both Sigma and Apple Aperture, and perhaps they might come back with some way of correcting it.
If not, I guess I'm telling Dyxum members that photos taken with third party lenses are likely to have EXIF data that is not to be trusted.
Unfortunately, as a Mac/Aperture user, the PC based AlphaLensInfo solution does not apply.
Joe
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adrichardson View Drop Down
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Posts: 180 		Post Options Post Options   Quote adrichardson Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2012 at 13:36
I have the same problem with my Sigma 30mm - it's identified as a 100-300mm in the EXIF data, but shows the correct apertrue and FL.

As far as I'm aware, this is down to it sharing the same lens ID as the Sigma 100-300 (the other EXIF information appears to be accurate though). It's worth checking the lens ID if you're planning on making any AF micro adjustments, it will affect all lenses with the same ID.
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eccles View Drop Down
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Posts: 998 		Post Options Post Options   Quote eccles Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2012 at 13:52
My only 3rd party lens at present is a Tamron 180mm macro that carries the same ID as a Minolta 100mm macro but with an additional suffix (something like xxx-01). I have a Minolta 100mm as well. The A77 can differentiate between the two and I have stored separate micro-adjustment settings for each. I don't know whether this is the case for all third party lenses, or even all Tamron lenses, but it looks like it's possible, or even likely with the A77. A friend's A900 was not able to store separate settings, so presumably was unable to read the suffix part of the ID.
Although this doesn't help the OP with the A900, it does potentially solve the problem with its eventual successor.
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Serdar A View Drop Down
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Posts: 7154 		Post Options Post Options   Quote Serdar A Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2012 at 14:02
eccles: You may want to double check to confirm this. The lens id is an integer field and it has no .xx part. You may have thought you stored two separate adjustments, but I suspect the second one you set overwrote the first. This is what A850/A900 would have done and this is probably what the A77 is doing unless Sony rewrote the firmware and the lookup table is no longer stores only the lens id vs setting, but takes other factors such as focal length and max aperture into account.

Edit: nevermind. It seems Sony improved things a little.
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robertsmx View Drop Down
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Posts: 493 		Post Options Post Options   Quote robertsmx Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2012 at 16:08
Originally posted by eccles eccles wrote:

My only 3rd party lens at present is a Tamron 180mm macro that carries the same ID as a Minolta 100mm macro...

I have noticed that with my Tamron 90mm macro as well. The lens gets labeled as 100mm macro, but EXIF does register the correct focal length (90mm). Coincidentally, this is not a problem with any other third party lens (Sigma 24mm is labeled as 24mm, Sigma 18-250 is labeled as 18-250) but likely because those are focal lengths found in Minolta/Sony database as well, whereas 90mm is perhaps "different".
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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eccles View Drop Down
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Posts: 998 		Post Options Post Options   Quote eccles Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 00:12
It seems Sony improved things a little.

Yes they have. But you could be right. I assumed the A77 used the whole lens ID including suffix but maybe they do take focal length or other parameters into account instead.
This list is useful:
here
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eccles View Drop Down
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Posts: 998 		Post Options Post Options   Quote eccles Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 00:52
I've been checking lens IDs. I think the Tamron 180mm actually uses ID 28 which equates to the 100mm (D) Minolta. Since my Minolta 100mm is a series 1 it could well be a different ID, maybe 25811. I know that my friend's A900 couldn't differentiate between the Tamron 180 and his Sony 100mm macro, so I'll need to test this out with the A77 to be sure that things have indeed improved.
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eccles View Drop Down
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Posts: 998 		Post Options Post Options   Quote eccles Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 16:42
I've just checked my Minolta 100mm series 1 and the lens ID is 25811. Since the Tamron uses ID 28 this could well account for the fact that I can successfully store two sets of data. I still need to check with the friend's Sony 100mm to see if the ID clash is still there.
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Serdar A View Drop Down
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Posts: 7154 		Post Options Post Options   Quote Serdar A Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 16:51
Thanks for all your efforts Mike.
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Hotdog View Drop Down
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Posts: 1310 		Post Options Post Options   Quote Hotdog Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 16:57
My Tamron 180 macro shows up as a Minolta 100 macro in the EXIF data on my A55.
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Micholand View Drop Down
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Posts: 19165 		Post Options Post Options   Quote Micholand Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 19:29
Due to the fact that the camera only records a lens ID number, not a lens name and these numbers aren't unique, there always is an uncertainty that third-party lenses are incorrectly identified by the SW used to read this info. Especially because third-party lenses frequently reuse the same overlapping ID of some Sony/Minolta lenses.

List of A-mount lens ID:
Sony LensType Values
AlphaLensInfo Lens ID
/Michael

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mikey2000 View Drop Down
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Posts: 11659 		Post Options Post Options   Quote mikey2000 Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 20:17
My a77 can't distinguish between my Sigma 18-250 and Sigma 70-200/2.8. They share the same lens but the 70-200 needs a tiny AF micro adjustment. When I put the 18-250 back on, I have to remember to set the AF micro adjustment back to zero.

Alphalensinfo also seems to struggle telling the two apart, but I think I might not have the latest version.   I've been working around the problem by having two different lenses.txt files. It quite rare that I have shots from both lenses in the same folder.   They still record the correct focal length though.   Perhaps the sigma 15mm has a little ROM bug where it outputs the wrong info into the exif. How does it fair on other cameras or on a windows/Lightroom setup?
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robertsmx View Drop Down
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Posts: 493 		Post Options Post Options   Quote robertsmx Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 21:25
Does the A77 recognize the 18-250 as 18-250, and 70-200 as 18-250? I have only the former and my A55 will recognize it as 18-250.
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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