Officina Stellare is an international engineering company based in Sarcedo, Italy. It designs opto-mechanical and aerospace instrumentation for ground based and space based applications. The range of optical systems includes: Ritchey Chrétien, Aplanatic Ritchey Chrétien, Ultra Corrected Ritchey Chrétien, Riccardi Dall-Kirkham, Riccardi-Honders, Maksutov Cassegrain, Apochromatic Refractors, custom design optics. Wikipedia