The CRisp Imaging SpectroPolarimeter (CRISP) is installed in the red beam and is usable from 510 to 860 nm. It consists of 0.3-0.9 nm wide pre-filters, liquid crystal (LC) modulation, a dual Fabry-Pérot (FP) tunable filter system, and a polarizing beam splitter located close to the final focal plane and feeding two 1k×1k-pixel Sarnoff CCD cameras. The FP system has a compact telecentric optical design with a minimum number of optical surfaces and high overall transmission. MOMFBD image restoration is aided with a third CCD recording broad-band images through the pre-filter. All three cameras are synchronized by use of an external shutter.
Spectral coverage: 0.3-0.9nm