Test performed with a 1Ds on tripod, with mirror lock-up & remote release. IS was turned off on all lenses with IS. Actual 100% image crop of the center. Raw conversion with PSCS - Sharpness, Luminous Smoothing & Reduce Color Noise set at zero. No prost proecessing except combining all 6 images. Lenese at wide open and also f5.6 for faster lenses.