Thanks Peter for answering.

First of all, I used DNG converter 4.3.1 AND 6.1..250 (lastest I catch from the Web today) and
both did the same. I also used ExifTool 8.07 and 8.27 in order to minimize risks of a bad handling
of the DNG file format from that tool.

Yes it is possible to give you both files, but they are quite big (~14 Mo each). How can I send them
to you?

Regards,
Palou

Hi all,

I'm evaluating the DNG advantages and find an interesting bug in the free
tool from Adobe, DNG Converter. I just wonder if any of you experimented
the same.

My concern is about the metadata enclosed in the file; it seems that DNG
Converter corrupts some of them (e.g. the circle of confusion, the shutter
speed and others). My test was simple; I converted one of my RAW file
(.CR2 from a Canon 40D) to DNG, then used ExifTool to read out the full
metadata from both files. The comparison of the result was not the same!

The DNG file changed the scale factor to 35mm Eq. (from 1.6 for the original
 to 3.3), the CoC (from 0.019 in the original to 0.009), the field of view, the
Hyper focal distance, and so on.

I wonder to use the DNG format as archive file format if it not store correctly
such information.

Is there a better (I mean correct) tool to convert my RAW to DNG?