Reducers / Flatteners
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Used in prime-focus imaging, reducers increase photographic speed while flatteners decrease image curvature away from the center.
Important Note: The following products were all designed for an optimum 55mm back focus. (Distance from flange surface to film or CCD plane). If you use a CCD, be sure the spacing between flange and CCD is 56mm +/-2mm for best results.