Big DNG files from E-P1 RAWs

Hi,
I am converting RAW files from my E-P1 to DNG using the new DNG Converter 5.5RC. To use the DNGs in Lightroom 1.0 I have to use "Camera RAW 4.6 and newer" as compatibility setting. This results in extremly big DNG files (I did not embed the original RAW).
original ORF file:12.2 MB
converted DNG 4.6: 46.6 MB
converted DNG 5.4: 12.7 MB
This problem only occurs with pictures taken with the olympus kit lens. Pictures taken with an old adapted manual lens don't have that problem. I suspect that the problem relates to the lens corretion data, that is only present with the kit lens.
Does anyone have the same problem? Is this a general problem with old DNG versions or a bug in the DNG Converter 5.5RC?
Thanks,
Michael

Can not you disable the lens correction feature in your camera?
I am not speaking for Adobe, but I "feel their pain": the Oly lens correction is only one feature of many-many among all native raw files. If the DNG interface contained options for all featires, which may be reasonable candidate for disabling, the dialog would become horrendeous.
The core of the problem is, that the previous DNG version [i]could not[/i] carry the lens correction info, for the specification did not have a respective element for that. Therefor the DNG converter has to perform the correction itself, instead of letting the "real" raw processing do that. This has been mended in the newer version, i.e. the DNG converter can now "pass" the lens correction info to the raw processor in meta format, the raw data itself does not need to be changed during the conversion in DNG.
Gabor

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Can't .dng have more than 10-bit depth?
Sverk

Well, according to the user manual and to the review in
http://www.imaging-resource.com/PRODS/D90/D90A.HTM
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Might there be something about the de-mosaicing that necessarily consumes two bits of depth? Whether in the .dng conversion -- or when saved .nef files are later to be used?
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Sverk

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