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Thread started 26 Jan 2010 (Tuesday) 22:16
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5D mkII RAW file size/image quality?

Senior Member
760 posts
Joined Mar 2008
Location: Chicago
Jan 26, 2010 22:16 |  #1

Quick question for any of pixel scientists here (I mean that in a good way)...sorry if it's a dumb one.

Is there any loss of image quality if I use sRAW1 or sRAW2 as opposed to the full size RAW? Is there some kind of squeezing of the pixels that results in losing some of the glorious perfection of the full size RAW files?

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Aug 09, 2011 00:20 |  #2 …hp?p=8343174&po​stcount=13


1,095 posts
Joined Jan 2009
Aug 09, 2011 00:31 as a reply to  @ jklewer's post |  #3

I believe there should be no loss of quality - just a file that will limit the size of the image.

Since I don't own a 5D2, I asked about this same question of Canon regarding my own camera, a 7D - the full size RAW files from a 7D are about 25MB...the mRAW files are listed as being on average about 10MB - I was told that the quality would be the same - no loss of detail or color, etc....but it would be more like as if I had shot with a camera like the 40D which has 10MP and creates full size RAW files of 10MB.

Hope this helps - and I hope it's accurate since a lot of what I do would be better for me if I had 10MB RAW files - easier and faster to post process and for stuff like youth sports, where there are very rarely calls for anything larger than 8x10", I'd at the very least be able to use less storage when shooting (by more than half).


Wow, what a nice picture! You must have a really great camera!

Fatal attraction.
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Location: Gesher Haziv, Israel
Aug 09, 2011 06:01 |  #4

^^^^^ What delija said.

The critical viewer would see the difference above 8x10 (8x12); the average viewer wouldn't see much of a difference until 11x16.5 inches. The majority of my printing is 11x16 (A3) but I consider myself to have a good eye, even if nobody else does, and above all I have to satisfy myself, so I always shoot full sized RAW.

Elie / אלי

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5D mkII RAW file size/image quality?
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