I think there are two lenses arranged such that the one closest to you inverts the inverted image? just thinking aloud. -achal ----- Original Message ----- From: "Gregory Fraser" <Gregory.Fraser@pwgsc.gc.ca> To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@ase-listmail.rit.edu> Sent: Monday, May 06, 2002 6:24 AM Subject: Not really photography but optics related > Does anybody know why the image in an apartment door peep-hole is not > inverted? Is there a tiny little penta-prism in there? > > Greg Fraser > >
