Hi there, I've been shooting with an E-PL3 using a manual focus Konica Hexanon for a few weeks now, and the process of converting the ORF files to DNG's has been painless. File size is ok, and the DNG's preview in OSX just fine. (I'm on 10.5.8, Photoshop CS3 and ACR 4.6). Now, I bought the Sigma 19mm native mft lens, and when I convert to DNG, I get 40mb file sizes, and no preview in the OSX finder. (in the Adobe dng converter linear setting is off and embedded original off). Can someone tell me what's going on here? confused... EDIT: when I tell Adobe DNG Converter to use 5.6 camera raw compatibility the file sizes return to normal, but still no thumbnail preview, and I can't use these files in my CS3.