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Up: Image quality with

8. Conclusion

We have processed NGS AO data with a Sr ranging from a few per cent to 0.4 which are typical values achieved by operational AO systems under average seeing conditions and corresponds to the partial correction regime. Psf calibration actually sets the limits in extracting information from AO deconvolved images. Despite this limitation, accuracies in the AO images of a few mas in relative astrometry and a few per cent in relative photometry, with a dynamic range up to 104 and a diffraction-limited resolution are achievable on the current systems. These performances should be improving in a near future thanks to better calibration/deconvolution processes or if higher Strehl ratios are systematically achieved. Among the solutions, we have seen a promising near-sighted deconvolution which might be a way to fully use the information contained in the AO images.

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