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Achieving tighter control over the falloff in MTF across the image plane largely relied on a redesign that used large aperture aspherical lens elements and deployment of Fluorite and Hi-UD glass elements. Leveling the variations in MTF across the focal range was achieved by an innovative redesign of the variator and compensator groupings that constitute the zoom controlling elements. A significant redesign of the input floating focus system was a major contributor to tightening the control in MTF variations as the subject distance from the lens front varied.
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