K band images of a binary system obtained with CIAO and AO using a circular lyot stop (top) and a lyot stop with a spider pattern (bottom). The natural seeing was 0.5" at R; The FWHM after the AO correction was 0.07" at K. A 0.4" diamter mask was centered on the primary star. The secondary star is 0.6" away from the primary with the magunitude difference of 4.9 mag at K.

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