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Telescope Engineering APO140ED Prime Focus Field Flattener



TEC Field Flattener (FF) has been designed for correcting field curvature and off-axis astigmatism of the APO140. FF has a wide-spaced two lens design that corrects abberations most efficiently. Combination of APO140 with FF gives highly corrected field with round spot under 15mk in diameter over entire field 6x7cm (Pentax 67). Distortion on the edge of the field is less than 0.5%.



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