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The Mamiya Leaf 100 x 100mm Lens Cast Calibration Diffuser is an accessory used to create LCC profiles for eliminating lens casts, light falloff, and color shifts common to working with wide-angle lenses and view camera movements. It is designed to be used in conjunction with Capture One Pro's LCC (Lens Cast Calibration) tool in order to produce more even illumination and consistent color accuracy from edge-to-edge.
The diffuser is constructed from 3mm-thick white acrylic, which has been sand-blasted to a smooth matte texture.
For use, the diffuser is placed over the lens before or after the main exposure in order to produce a reference image for Capture One's LCC profiling function. The exposure may need to be increased to produce the reference image, and exposure should only be increased with a longer shutter speed in order to maintain the same lens performance at the given aperture.