The first generation of ELT instruments includes an optical-infrared high resolution spectrograph, indicated as ELT-HIRES and recently christened ANDES (ArmazoNes high Dispersion Echelle Spectrograph). ANDES consists of three fibre-fed spectrographs (UBV, RIZ, YJH) providing a spectral resolution of ∼100,000 with a minimum simultaneous wavelength

ANDES is a high-resolution spectrograph, extremely stable and fed with fibres, under the development for the ELT Telescope. This paper contains an overview of the Phase-A design status of the opto-mechanics and Optical Bench structure of the visible arm of ANDES, including a materials trade-off, several FEMs and lessons learned from the projects in

WEAVE is the new wide-field spectroscopy facility 1,2,3 for the prime focus of the William Herschel Telescope in La Palma, Spain. Its fibre positioner is essential for the accurate placement of the spectrograph's 960 fibre multiplex. We provide an overview of the recent maintenance, flexure modifications, and calibration measurements conducted at

This conference presentation was prepared for the Ground-based and Airborne Telescopes IX conference at SPIE Astronomical Telescopes + Instrumentation, 2022.

Being the NRT 1 an international collaboration to design and build a leading astronomical facility, it will be focused in the optical and near infrared ranges for the emergent area of time domain astronomy. This will rely on the mix of a large collecting area (4 m diameter), quick response (<30 s), and full robotic operation. The Telescope Level

The effects of atmospheric dispersion on the performance of astronomical Adaptive Optics (AO) were already described in the 70's, and they are generally regarded irrelevant to nighttime AO, except for the very specific case of Extreme AO for the next generation of 30 and 40-m class large ground-based telescopes. However, the situation changes when