Notes about Keplerian 'expanded field' telescopes. – Dr Henry Greene
Galilean and Keplerian telescopes - American Academy of Ophthalmology
Telescopes and Microscopes
Refracting telescope. Refracting telescope The Galilean telescope The objective lens, whose focal length is f, performs the same function. - ppt video online download
Comparison of Galilean and Keplerian telescopes. - American Academy of Ophthalmology
History of Science Society -- Committee on Education
Optometric Management - July 2021
Are Keplerian vs Galilean Telescopes Usually Smaller