As to Aperture, it's DNG support is broken and has been since inception. It will only support DNG's that are from natively supported cameras (whether the DNG is the native RAW format or the original RAW format is converted to DNG). RAW files converted to DNG from any unsupported camera, or native DNG's from an unsupported camera will not work. Capture One's DNG support is even worse (It won't support native DNG's from the Pentax K20D, but will support PEF's from the same camera).
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