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As long as you use the latest version of DNG Converter I see no reason to
keep the original RAW file. If you are worried about it you can of course
tell DNG Converter to convert to DNG and embed the original RAW file that
should you need it you can extract from the DNG later. However, this will
make for much larger DNG files. I have never had a need to do this and have
several cameras RAW files converted to DNG that I no longer have the camera
and have not had any problems. I think DNG is about as safe as you can get.
I convert my files to DNG and notice that they are substantially larger than the original file. My CR2 file is about 7 mb while my DNG file are about 14 mb? I don't embed the original raw file so why is the DNG so much larger?
Did you turn on the lossless compression? On my Pentax K20D I run the
cameras DNG and PEF files through DNG Converter just to compress them. This
generally cuts their size by about 1/2. I suspect you aren't turning on
compression. Since it is lossless compression you don't have to worry about
image quality issues.
Some file sizes are larger, but most are smaller through compression.
That is to be expected. Some images just compress better than others. Images
with lots of fine details will not compress as good as say an image with a
lot of no detail blue sky.