Strehl ratios of up to 44% have been achieved, this being a final Strehl number measured on the science detector. It includes all static aberrations in the system. Correcting for the calibrated SR of about 75% on the science detector, or maximum SR is about 63%. The limiting magnitude is currently about mK=7.4. There is hope to improve this by about 1 mag within the next 12 months.

Note the drop-off between mK≈6 and mK=7.4, which resembles the linear descend of a typical Shack-Hartmann performance curve, not a predicted PWFS limit.

Above the tip-tilt jitter is given as RMS in mas. In full closed-loop the jitter RMS is about 20mas. When only the tip-tilt loop is closed, the jitter is higher by a factor of about 2-3. This difference is predicted from the fact that without high-order correction the PSF on the pyramid tip has a great FWHM, hampering the tip-tilt correction.

M. Feldt, May 2007