Lucky Imaging (or Lucky Exposures)
is a means of producing high resolution images
in the face of Atmospheric distortion. Numerous images are
taken at relatively short exposures and then a subset are
selected and combined. The technique has been used by
amateur astronomers since the mid-twentieth century
and is used by professional astronomers as well.
With the technique, Diffraction Limited observation
is achievable. It can be considered
an alternative to Adaptive Optics but also can be combined with
adaptive optics to yield even higher resolution.