Elsewhere, Thomas Knoll said ACR 4.5 (currently in Beta status) was the first ACR version to fully implement the new DNG 1.2 specification.
Are there any disadvantages to expect when
re-converting our raw files to DNG with the DNG Converter 4.5? What if the original raw files aren't around anymore; does it make sense to push DNG 1.0 or 1.1 files through DNG Converter 4.5?
>does it make sense to push DNG 1.0 or 1.1 files through DNG Converter 4.5?
For older cameras whose support is already in the current shipping version of DNG, I wouldn't think there is a need to reconvert earlier versions of DNG files. There is built in compatibility. Moving forward there may be reasons once Lightroom 2.0 ships and the next full version update of Camera Raw ships (in the next version of Photoshop).
No, there are no advantages of reconverting from the original raw files vs. just "upgrading" the old DNG files to new DNG files by running them through the DNG converter again.
The primary benefit of DNG 1.2 at this time the MD5 hash of the raw data that is maintained in the DNG file. This allows Camera Raw 4.5 to detect and warning about image damage due to disk or memory errors if the DNG files gets corrupted sometime after it was first created.
The main advantage of DNG 1.2 in the future is support for the new camera profile color model, and the ability to embed multiple camera profiles in the DNG file. But that benefit requires some actual profiles that use this new model, which are not available just yet...