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02-12-2020, 07:06 AM   #1
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Magic Tamron becomes Pentax

I bought a used Tamron 28-105 to substitute for the Pentax 18-55 as a "walking-around" lens. Checking the EXIF (using Affinity Photo) the shots from the Tamron appear as a Pentax F 28-105. I am less than sophisticated with the data aspects or most aspects of the modern world. I certainly would not misrepresent a shot even if it was of little consequence. However, I am curious about this and would correct it if possible. At this point I would be blundering around. Can someone enlighten me?

02-12-2020, 07:23 AM   #2
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Pentax F 28-105? There was never a Pentax F 28-105...The F series had a 35-105 (The lens type value could also be a Sigma or Tokina)

There are several Pentax FA 28-105s...

The smc PENTAX-FA 28-200mm F3.8-5.6 AL[IF] was a rebadged Tamron and shares the same EXIF LensType value.

Pentax Tags

LensTagger is a Lightroom only plugin that can change the reported LensType...but you have to pay the Adobe tax...

LensTagger Ė Exiftool Lightroom Plugin

Edit: Google turned up a stand-alone...

NameThatLens - Jazzycamel Photography

Last edited by boriscleto; 02-12-2020 at 07:34 AM.
02-12-2020, 07:23 AM - 3 Likes   #3
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Here's what's going on to get the model of the lens that took a picture: The lens sends a code to the camera body via the data pin, the camera dutifully stores that number in the EXIF file, and the PC program looks up that number in a database created by the developer.

Here's how a lens can get the wrong model in the EXIF:

1. The lens maker used a code number also used by another lens. (it can occur with 3rd party lenses)
2. The data pin is dirty and the number was garbled. (unlikely)
3. The app developer has an error in their lens database. (very very common)
02-12-2020, 08:17 AM   #4
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QuoteOriginally posted by boriscleto Quote
Pentax F 28-105? There was never a Pentax F 28-105...The F series had a 35-105 (The lens type value could also be a Sigma or Tokina)

There are several Pentax FA 28-105s...
Yes it is FA. Normally I would claim TYPO but in this case I was just lazy. Thanks for the response.

02-12-2020, 08:35 AM   #5
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Actually the Pentax FA 28-105/4-5.6 [IF] was a Tamron AF (IF) 28-105 F4-5.6 (179D), but with Pentax electronics and coating (as stated by K-mount page).

This makes a mix-up likely. But I would expect a Pentax lens to be called as a Tamron and not vice versa. Funny thing.



02-12-2020, 08:56 AM - 1 Like   #6
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QuoteOriginally posted by Papa_Joe Quote
Actually the Pentax FA 28-105/4-5.6 [IF] was a Tamron AF (IF) 28-105 F4-5.6 (179D), but with Pentax electronics and coating (as stated by K-mount page).

This makes a mix-up likely. But I would expect a Pentax lens to be called as a Tamron and not vice versa. Funny thing.



The Pentax FA 100mm F3.5 Macro was made by Cosina. I have the Phoenix 100mm F3.5 Macro and it is reported as the FA.
02-12-2020, 08:59 AM   #7
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The lens passes a numeric code and Affinity has a lookup table for known codes, that is what is displayed by the program. Unfortunately some third party makers' lenses use the same codes as Pentax or ambiguous codes or, in your case, the same code ("4 15") was used for both the Tamron and Pentax versions of the same lens.

You can batch edit the EXIF using ExifTool if you wish, but doing so may be more trouble than its worth.


Steve

(...Lightroom displays my Sigma 50/2.8 EX DG Macro as Pentax-F 50/2.8 Macro...same code...)
02-12-2020, 09:35 AM   #8
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Since Tamron made Pentax lenses, it could be that the Pentax electronics was accidentally put in a Tamron model (or Tamron didn't bother to change the ID code on the Tamron run). As Papa_Joe mentioned, I have a Pentax lens that was available as a Tamron less the labeling and Multi-Coatings Pentax utilized, both made in the same factory.

02-12-2020, 09:48 AM   #9
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QuoteOriginally posted by stevebrot Quote
You can batch edit the EXIF using ExifTool if you wish, but doing so may be more trouble than its worth
The app I linked to is just a gui front end for exiftool batch editing...
02-12-2020, 03:34 PM   #10
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QuoteOriginally posted by gump Quote
I bought a used Tamron 28-105 to substitute for the Pentax 18-55 as a "walking-around" lens. Checking the EXIF (using Affinity Photo) the shots from the Tamron appear as a Pentax F 28-105. I am less than sophisticated with the data aspects or most aspects of the modern world. I certainly would not misrepresent a shot even if it was of little consequence. However, I am curious about this and would correct it if possible. At this point I would be blundering around. Can someone enlighten me?
I have had a couple of copies of that lens and a Promaster badged copy, they all report As a Pentax FA version. Itís a very good lens by the way, the only reason I quit using it was because the DA 18-135 is weather sealed. Itís one of the best autofocus lenses youíll find for the money, you can find them very cheap.
02-12-2020, 07:55 PM   #11
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QuoteOriginally posted by Papa_Joe Quote
Actually the Pentax FA 28-105/4-5.6 [IF] was a Tamron AF (IF) 28-105 F4-5.6 (179D), but with Pentax electronics and coating (as stated by K-mount page).

This makes a mix-up likely. But I would expect a Pentax lens to be called as a Tamron and not vice versa. Funny thing.


I just picked up the Tamron version, and it reports as an "smc Pentax-FA...". I was surprised. Wish it meant the lens had SMC coatings.... But nice lens even without them.
02-13-2020, 09:52 AM   #12
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Lightroom "sees" my Pentax HD FA 50 1.4 as a Canon lens with those same specs.
?
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