 Catadioptric mirrors similar to the Mangin are found in the Klevtsov–Cassegrain, Argunov–Cassegrain telescopes, and Ludwig Schupmann's Schupmann medial telescope.They are also used in compact catadioptric photographic lens designs that save on mass since aberration can be corrected by the mirror, itself.Mangin mirrors are also used in null correctors, which are used to fabricate large aspheric mirrors.