Gregory-Coudé, evacuated, primary mirror has a diameter of 45 cm, total focal length: 25 m.
Czerny-Turner, focal length: 10 m, grating 180 mm x 360 mm, 316 lines / mm, blaze 63°.
Zurich IMaging Polarimeter (ZIMPOL). Sensitivity can reach 0.001%.
Fabry-Perot filter system
Tunable narrow-band filter system based on two lithium-niobate Fabry-Perot etalons. It allows monochromatic imaging at any wavelength from 395 nm to 660 nm.
Adaptive optic system
Tip-tilt and deformable mirror with 37 actuators.