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I thought people were complaining about the file size the other way. When you compare this with 70+ MB of a D800 file size, you ask why, despite both being the 36 megapixels cameras, Sony A7r has a fixed file size of 37MB. People tend to think that this is because Sony is offering compressed/lossy RAWs.
I have read about it elsewhere. I would love to see an option for at least 'lossless' raws.
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Does the 36MB file size vary much? You can still have lossless compression as well as lossy compression to save space compared to totally uncompressed data.
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The raw files of the 24Mpix Sony A900 were also 36MB. I was expecting much bigger for the A7r.