I would like feedback on the best practice for image quality when it comes to downsizing MP of an image.  I use a 5D Mk III that can shoot 22Mp or 10Mp if i use the RAW-M setting.  Will I get better image quality if I shoot in the RAW-M or if I downsize the raw file in post production using lightroom/photoshop?  Thank you.


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I would think if you want smaller files it would be best to shoot them small and not risk creating funky artifacts by downsizing.   I suggest you set up a test.   Mount the camera on a tripod and set up a shot like you usually take.   Take the images both ways, downsize the larger ones and compare.   The type of lens may even play into the mix.   

BTW:  I have the same camera and I love it.   I shoot RAW-L and upload them that way unless the image is slightly soft.