The older 2010 MBP seems to have a larger aperture, subjectively, which seems the opposite of how I'd expect things to go. Visually, I was hard pressed to notice anything different between the two cameras on the outside. Dark performance is also slightly better, again with a different color cast. The old model also had less than perfect exposure (the light part at the right of the cup is completely saturated) compared to the new. The difference is easily discernible in the color checker card. White balance is changed, with the old 2010 model having a slightly reddish cast. It isn't perfect, and even with gobs of light there's noise visible, but the quality is dramatically better. You just get a wider image at higher resolution. The 2011 MBP's optical system achieves almost the exact same magnification (eg the height of the test objects remains the same if you scale vertical resolution) as the 2010 model.
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