I have a Sony A7rIV raw converted to DNG that I'm attempting to remove the lens correction profiles from. I'm able to remove the OpcodeList3 entries but not OpcodeList2 - exiftool seems to ignore the request. It reports the OpcodeList2 entries even after attempting deletion.
Command line:
exiftool -OpCodeList2= -OpCodeList3= -overwrite_original Sony_A7rIV_20mm.dng
I tried a few older DNG conversions/versions of the same file and see the same behavior.
Here's a link to a DNG that this can be reproduced with: Sony_A7rIV_20mm.dng (Google Drive) (https://drive.google.com/file/d/1LrYVkZQ8Izhb0OZbYTpR-59uoNoTTnDx/view?usp=sharing)
If you look at the file with the command in FAQ #3 (https://exiftool.org/faq.html#Q3) (limiting it to just OpcodeList* tags), you will see that there are multiple OpcodeList2, but they are in locations other than SubIFD
C:\>exiftool -G1 -a -s -op* Y:\!temp\x\y\z\Sony_A7rIV_20mm.dng
[SubIFD] OpcodeList3 : WarpRectilinear
[SubIFD2] OpcodeList2 : MapPolynomial, MapPolynomial, MapPolynomial
[SubIFD3] OpcodeList2 : MapPolynomial, MapPolynomial, MapPolynomial
[SubIFD4] OpcodeList2 : MapPolynomial, MapPolynomial, MapPolynomial
By default, exiftool will not remove the tag from locations other than the main SubIFD. To remove these, you need to include the exact group
C:\>exiftool -P -overwrite_original -SubIFD2:OpcodeList2= Y:\!temp\x\y\z\Sony_A7rIV_20mm.dng
1 image files updated
C:\>exiftool -G1 -a -s -op* Y:\!temp\x\y\z\Sony_A7rIV_20mm.dng
[SubIFD] OpcodeList3 : WarpRectilinear
[SubIFD3] OpcodeList2 : MapPolynomial, MapPolynomial, MapPolynomial
[SubIFD4] OpcodeList2 : MapPolynomial, MapPolynomial, MapPolynomial
C:\>exiftool -P -overwrite_original -SubIFD3:OpcodeList2= -SubIFD4:OpcodeList2= Y:\!temp\x\y\z\Sony_A7rIV_20mm.dng
1 image files updated
C:\>exiftool -G1 -a -s -op* Y:\!temp\x\y\z\Sony_A7rIV_20mm.dng
[SubIFD] OpcodeList3 : WarpRectilinear
Thanks @StarGeek!