Simplify the following text for a Grade 6 native English-speaking person.
Original: The observatory currently consists of three large telescopes : the 200 i Hale telescope , the 48 i Samuel Oschin telescope , and a 60 i reflecting telescope .
Simplified: The observatory is made up of four main telescopes : the 200 inch ( 5.08 m ) Hale telescope , the 48 inch ( 1.22 m ) Samuel Oschin telescope , the 18 inch ( 457 millimeter ) Schmidt telescope , and a 60 inch ( 1.52 m ) reflecting telescope .