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Explain File Sizes Recorded in RAW

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doug_stroud Registered since 05th Oct 2011
Fri 17-Feb-12 01:35 PM

"Explain File Sizes Recorded in RAW"

I posted this in the D300 forum and have not had any responses. I shoot w/ a D700 and a D3s and my friend uses the D300s. She sent me a file to process and this is what has piqued my question.

File sizes range in size and I would like to learn how this works.

D300s has 12mg resolution and I get from a 25mg file to a 9 mg file when I examine the properties.

If I open it in Photoshop it may tell me I have a 34mg size file and the same file size is read at 25mg file by Photo Mechanic.

Could someone explain this?