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For extreme low-light situations, High ISO Noise Reduction captures and stacks four frames simultaneously to help reduce noise when shooting at 6400 and 12,800 (with noise reduction enabled).
These features include Canon's Auto Lighting Optimizer to enhance shadow detail and add contrast to "flat" scenes, Highlight Tone Priority adding up to one stop of detail in bright highlight areas, Peripheral Illumination Correction for automatic correction of vignetting, High ISO Noise Reduction with four user-selectable settings, and Long Exposure Noise Reduction applied to exposures one second or longer.
The powerful EXPEED 4 image-processing engine incorporates an entirely new algorithm for even higher ISO noise reduction and color fidelity, resulting in an enhanced overall sharpness and clarity without sacrificing subtle textures and luminous details.