Four pieces of unknown optics from the collection of Otto Berg, including: one 5.75″ concave mirror; two large compound lenses (one 4.5″ in diameter and 2.25″ long; the other 5.25″ in diameter and 7.25″ long); and a compound telescope (7″ in diameter and 5.5″ long). In overall good to very good condition, with overall wear and soiling.
From the collection of Dr. Otto Berg.
