Although this section might not be as valuable as it was back in the days of 4:3 TVs, I've decided to keep it and update it with some newer examples. It's important to preserve this information not only for historical reasons but also because some content is still broadcast in the wrong aspect ratio, although this is not nearly as common as it was in the past.
Academy Ratio (1.37:1)
Original frame
Star Trek: Deep Space Nine © 1993-1999 Paramount
Properly shown on a 16:9 TV
Improperly shown in stretch-o-vision on 16:9 TV
Star Trek: Deep Space Nine © 1993-1999 Paramount
Properly shown on a 16:9 TV
Improperly shown in stretch-o-vision on 16:9 TV
16:9 or 1.77:1
Original frame (was not filmed in open matte)
Memphis Belle © 1990 Warner Bros. and Enigma Productions Properly shown on a 4:3 TV
Improperly shown in pan-and-scan on 4:3 TV
24.8% of the image is lost
Memphis Belle © 1990 Warner Bros. and Enigma Productions Properly shown on a 4:3 TV
Improperly shown in pan-and-scan on 4:3 TV
24.8% of the image is lost
2:1 Panavision (anamorphic) - Example for The Dark Crystal
Original frame © 1982 The Jim Henson Company
Properly shown on a 4:3 TV
Properly shown on a 16:9 TV
Properly shown on a 4:3 TV
Properly shown on a 16:9 TV
Improperly shown in pan-and-scan on 4:3 TV
33.5% of the image is lost
Improperly shown in pan-and-scan on 16:9 TV
11.5% of the image is lost
33.5% of the image is lost
Improperly shown in pan-and-scan on 16:9 TV
11.5% of the image is lost
"Scope" (2.35:1 and 2.39:1) - Example for Star Wars
Original frame © 1977 20th Century Fox.
Properly shown on a 4:3 TV
Properly shown on a 16:9 TV
Properly shown on a 4:3 TV
Properly shown on a 16:9 TV
Improperly shown in pan-and-scan on 4:3 TV
44.3% of the image is lost
Improperly shown in pan-and-scan on 16:9 TV
25.9% of the image is lost
44.3% of the image is lost
Improperly shown in pan-and-scan on 16:9 TV
25.9% of the image is lost
Cinerama (2.59:1) - Example for How The West Was Won
Original frame © 1962 MGM
Properly shown on a 4:3 TV
Properly shown on a 16:9 TV
Properly shown on a 4:3 TV
Properly shown on a 16:9 TV
Improperly shown in pan-and-scan on 4:3 TV
48.6% of the image is lost
Improperly shown in pan-and-scan on 16:9 TV
31.6% of the image is lost
48.6% of the image is lost
Improperly shown in pan-and-scan on 16:9 TV
31.6% of the image is lost