Gil De Paz, ArmandoGallego Maestro, Jesús2023-06-182023-06-1820160277-786X10.1117/12.2232208https://hdl.handle.net/20.500.14352/23224© 2016 SPIE. Artículo firmado por 12 autores. Conference on Ground-Based and Airborne Instrumentation for Astronomy (VI. 2016. Edinburgh, Scotland)MEGARA is the new IFU and multiobject spectrograph for Gran Telescopio Canarias. The spectograph will offer spectral resolution R-fwhm similar to 6,000, 12,000 and 18,700. Except for the optical fibers and microlenses, the complete MEGARA optical system has been manufactured in Mexico. This includes a field lens, a 5-lenses collimator, a 7-lenses camera and a complete set of volume phase holographic gratings with 36 flat windows and 24 prisms. All these elements are very large and complex, with very efficient antireflection coatings. Here the optical performance of MEGARA collimator and camera lenses and the field lens is presented.engjournal articlehttp://dx.doi.org/10.1117/12.2232208http://proceedings.spiedigitallibrary.org/open access52SpectrographsHigh precision opticsOptical testingCoatingsAstrofísicaAstronomía (Física)