Anamorphic Widescreen, as technology People & Technology

Anamorphic widescreen is a filmmaking and home video technique that uses the full area of the film frame (or disc resolution) to deliver a wider image than the native format would normally allow.

In production: Anamorphic lenses (typically Panavision or CinemaScope) optically squeeze a wide field of view onto the standard 35mm frame. A complementary lens on the projector unsqueezes the image to fill a widescreen theater. The result is a 2.35:1 or 2.40:1 image that uses the full negative area, yielding higher resolution than cropping a wider composition from a spherical lens.

On home video: "Anamorphic" on DVD means the widescreen image is stored using the full vertical resolution of the disc (480 lines on NTSC DVD), then stretched horizontally by the player. Non-anamorphic ("letterboxed") DVDs waste resolution on black bars baked into the image. Early DVD releases often included both "widescreen" (anamorphic) and "full screen" (pan-and-scan) versions, sometimes on a single flipper disc.

On Blu-ray and UHD, all widescreen content is stored at full resolution — the anamorphic vs. letterboxed distinction no longer applies. The term persists in disc reviews as a historical marker, especially for films originally shot with anamorphic lenses.

In the wiki

Film	Page	Summary
The Taking of Pelham One Two Three (1974)	Owen Roizman	Roizman chose anamorphic Panavision because the subway car matched the 2.4:1 aspect ratio
Invasion of the Body Snatchers (1978)	Physical Media Releases (Invasion of the Body Snatchers)	1998 MGM DVD was an anamorphic 1.85:1 widescreen transfer
Blow Out (1981)	Physical Media Releases (Blow Out)	2001 MGM DVD had 2.35:1 anamorphic widescreen transfer plus a full-frame option