Abstract
Atmospheric isoplanatism for visual wavelength image-reconstruction applications was measured on Mauna Kea in Hawaii. For most nights the correlation of the transform functions is substantially wider than the long-exposure transform function at separations up to 30 arcsec. Theoretical analysis shows that this is reasonable if the mean Fried parameter is approximately 30 cm at 5500 Å. Reconstructed image quality may be described by a Gaussian with a FWHM of λ/s0. Under average conditions, s0 (30 arcsec) exceeds 55 cm at 7000 Å. The results show that visual image quality in the 0.1–0.2-arcsec range is obtainable over much of the sky with large ground-based telescopes on this site.
© 1988 Optical Society of America
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