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We describe a number of experiments devoted to compensation for aberrations in the primary mirror of a telescope using a volume dynamic holography technique, where the writing and reading of the hologram are carried out indepeadently.Three sets of experiments demonstrating holographic aberration correction have been performed. In all cases transmitting holograms were formed in photorefractive crystals such as BSO and SBN. In experiments with a small diameter primary minor the image is formed by a multicolor point-like object. The system includes an unit wich compensates for the hologram dispersion. The aberration correction of a six-segmented primary mirror of 1 50 mm in diameter is demonstrated in conditions where there is a pronounced difference in the wavelengths of the recording beams and that of the source observed (AX=O.12 tim). The experiments on observation an extended object of continuous spectrum (&=O.35 tm) with a single primary mirror of 1 50 mm diameter have been also made.All these experiments indicate an efficient compensation for distortions ofthe primary mirror by the hologram.

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