As far as I know, DNG conversion does not strip any EXIF data.
I ran exiftool on a CR2 file and on a DNG from the same file and I was able to see both Focus Distance and Focal Length data in the DNG.
Is there additional data that DxO uses for lens corrections that you are not seeing in your converted DNGs?
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If DxO is not seeing lens info in DNGs, it's probably due to incompatibility of their DNG reader with Adobe's DNG writer. Such is quite common and a good reason not to convert to DNG if you intend to open your files in non-Adobe software. Just because some software says it can open DNGs, does not mean it will handle *your* DNGs properly. That said, try using a different DNG compatibility setting and see if that helps (the default is 1.4 but you may need 1.3, you could even try 1.1).
Do try exiftool and make sure it can see the lens info - the latest version of exiftool is DNG 1.4 compatible...
Something is definitely screwy here; and I am getting to think this may indeed be a DXO issue. But what is confusing, opening a CR2 file in Canon DPP and save as a TIFF, DXO ViewPoint 2 works just fine. It recogizes the lens and downloads the profile. However opening the same image in ACR, bringing into Photoshop and saving as a TIF - DXO cannot find the lens EXIF data.
Bizzare to say the least - I have opened a bug report with DXO and see what they have to say.
Thanks to all for feedback
Let us know what you hear back from DxO.
In the meantime, if you can send me a TIFF produced from Canon DPP and one from PS, that might help resolve the mystery on the Adobe side.
Send to firstname.lastname@example.org.
Will do, the files wil be sent via WeTransfer
I sure would be tempted to try:
* Converting to different DNG compatibility version.
* Use exiftool to replenish lens info (read it out, then write it back).
The first can be accomplished using the DNG converter.
The second can be accomplished using exiftool stand-alone, or Lightroom's Exportant plugin (export with option to copy all exif metadata to output file).