Main text and supporting information for the publication: Tallarini, L.; Lapo, G.; López Cerón, M. C.; Scheblykin, I. G.; Baranov, D., Cryo-optical setup for wide-field microscopy and spectroscopy of luminescent nanomaterials. Nanoscale, 2026, 18, 1474 - 1482, https://doi.org/10.1039/D5NR04127A