topic Re: Incorrect Lens Info? in EOS DSLR & Mirrorless Cameras

EOS R5 EXIF data misreports Canon lens as a Sigma lens

mjd531 — Tue, 02 Apr 2024 14:01:26 GMT

Both DPP and iPhoto say that the photos I just took were taken with a Sigma lens, but I had a Canon 24mm macro lens on our R5. Is Canon selling Sigma lenses that are branded as Canon? We bought it from a local store at the same time we bought the R5.

Re: Incorrect Lens Info?

Peter — Sat, 30 Mar 2024 23:01:32 GMT

If your lens is Canon RF 24mm F1.8 MACRO IS STM, then RFLensType should be 287 in the Makernotes. Yes? No? Upload a raw file if you are not sure.

The problem for iPhoto is probably the tag LensType. Unique numbers for Canon EF lenses but not for Canon RF lenses. All RF lenses are sharing the same LensType number 61182. If LensType=61182, then use RFLensType instead. iPhoto may think that LensType 61182 is Canon RF 50mm F1.2L USM.

One way to identify a lens when LensType is wrong is to go for the focal length and the maximum aperture. If iPhoto got Canon RF 50mm F1.2L USM but knows that the focal length is 24mm and the maximum aperture 1.8, then it will search for the next lens in its database: Sigma 24mm f/1.8 DG Macro EX.

I don't know why DPP is giving you the wrong information. Not the latest version?

Sigma 24mm f/1.8 DG Macro EX has LensType number 150, the same number as Canon EF 14mm f/2.8L USM has.

Re: Incorrect Lens Info?

shadowsports — Sat, 30 Mar 2024 22:47:33 GMT

Rest assured Canon is not rebranding or selling Sigma lenses. Something in your workflow or environment is incorrectly interpreting lens data as Peter mentioned.

Re: Incorrect Lens Info?

Peter — Sun, 31 Mar 2024 09:35:41 GMT

I tried a JPEG from this site https://www.photographyblog.com/reviews/canon_rf_24mm_f1_8_macro_is_stm_review/sample_images

darktable and DPP have no problems to identify the lens.

Re: Incorrect Lens Info?

johnrmoyer — Sun, 31 Mar 2024 12:01:00 GMT

@Peter is correct.

I prefer the LensModel tag to the LensType tag because the LensType tag is just a number and is only unique within the offerings from one manufacturer. The LensModel tag is a text string with the name of the lens. I guess, but do not know, that newer lenses supply that text string name to the camera and so the LensModel is how the lens names itself. Canon DPP software does not tell me which of the two tags is used to display the lens name. I am just guessing, but maybe if Canon DPP has downloaded the "Lens Data" for "Digital Lens Optimizer", then it might get it right.

Software often does not copy all of the metadata when saving a file, so the LensModel tag might have been lost.

exiftool -s -G0:2 -a -lenstype -lensmodel public_html/2019_Alaska/*.jpg

displays:

======== public_html/2019_Alaska/2019aug07_eagle_IMG_8590c.jpg
[MakerNotes:Camera] LensType                    : Canon EF 100-400mm f/4.5-5.6L IS II USM or Tamron Lens
[MakerNotes:Camera] LensModel                   : EF100-400mm f/4.5-5.6L IS II USM
[EXIF:Image]    LensModel                       : EF100-400mm f/4.5-5.6L IS II USM
======== public_html/2019_Alaska/2019aug07_glacier_IMG_8743c.jpg
[MakerNotes:Camera] LensType                    : Canon EF 100-400mm f/4.5-5.6L IS II USM or Tamron Lens
[MakerNotes:Camera] LensModel                   : EF100-400mm f/4.5-5.6L IS II USM
[EXIF:Image]    LensModel                       : EF100-400mm f/4.5-5.6L IS II USM

so I prefer the LensModel tag to the LensType tag.