Diffraction patterns formed by telescopes can take an infinite variety of forms depending on the imaging wavelength, telescope aperture shape, telescope aberrations, central obstructions, object shape, and the coherence properties of the illumination. Crepp, Jonathan Crass, David King, Andrew Bechter. The development involves a consortium including the IAC (La Laguna), the ING, Universities of Cartagena, Cologne and Cambridge. The effects of diffraction are fully taken into account by the expressions. ILocater: A diffraction-limited Doppler spectrometer for the Large Binocular Telescope. A new instrument (AOLI) is now been developed initially for use on the WHT 4.2 m telescope and also for the GTC 10.5 m telescope on la Palma. A new approach to building wavefront sensors will allow reference stars as faint as I=18.5 to be used on 8-10 m class telescopes to give angular resolutions in the visible of 15-20 milliarcseconds or 6-8 times that of Hubble. Large astronomical telescopes are almost invariably reflective, on-axis. As most telescopes either reflectors or refractors, dont have adjustable apertures, its mostly. However traditional (Shack-Hartmann) adaptive optics wavefront sensors require bright reference stars greatly limiting the applicability of the technique. Keywords: Schmidt telescopes, Antarctic astronomy, telescope optics. Design and characterization of a balloon-borne diffraction-limited submillimeter telescope platform for BLAST-TNG. The diffraction limits are related to the size of the aperture. Diffraction limited imaging in the visible has already been demonstrated on a 5 m telescope by combining Lucky Imaging with low order adaptive optics wavefront correction. Lucky Imaging techniques are able routinely to deliver Hubble resolution on Hubble size telescopes on the ground. Diffraction-limited 800 nm imaging with the 2.56 m Nordic optical telescope.
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