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Table 2

Resuts of the NZ retrieval process.

Sampling 5.3 pix/(λ/D)

Intra focal position [mm/rad]  −3.32 /  − 1.7π
Best focus position [mm/rad] 0.014 / 0.007 π
Extra focal position [mm/rad] 2.92 / 1.4 π
Number of Zernike polynomials 45
Strehl ratio without tip-tilt 60%
Strehl ratio on the retrieved pupil 36.5%
NACO Strehl ratio  ≈ 36 − 38%

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