I did some picture taking with Gary Rouleau yesterday; thought I'd give the Mark IV a workout at ISO 400. Upon reviewing the image files, I'd say that it looks great at ISO 400. Minimal noise and fantastic detail right out of the camera. IQ is a significant step up from the 7D. Also the blacks seem to handle exposure boosting much better than the 7D. Here's a Wood Duck from the image series.
Canon 1D Mark IV, 400mm, f/7.1, 1/2500, ISO 400, -1/3 EC, hand held








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