This isn't a real tough ISO test, but the single doe portrait (24% crop, 1/320, F4.5, 270mm) was at 800 ISO and the scene with the buck (41% crop, 1/800, f8, 280mm) was at 1000 ISO. No noise reduction has been applied to either. Both taken with 70-200 2.8 L + 1.4X TC. My 7D would have shown a lot more noise at identical settings, especially at 1000 ISO.



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