Abstract
The ESO NTT project is still in the conceptual phase but it is hoped early in 1982 to enter the engineering phase. With an aperture of 3.5 m it is seen also as a basic development aspect of our Very Large Telescope (VLT) project. The basic characteristics of the NTT are briefly reviewed with particular reference to the nature of the primary and its support system, which is strongly influenced by the active optics approach. Some relevant results of image analysis of existing conventional telescopes as well as some dome seeing and imaging monitoring results at the present ESO 3.6 m telescope are given. Brief comments are made on the concept of the ESO VLT.

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