An important feature of note in Fig. 16.4 is the Strehl ratio S, the normalized
intensity at the peak of each PSF. A diffraction-limited PSF has iS > 0.80, hence
the effect of the turbulence used to find the PSFs in Fig. 16.4 is to dramatically
decrease the Strehl ratio. This decrease, in turn, affects the limiting magnitude
and provides an incentive to correct for wavefront distortion.
Table 16.1 gives values o ...
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