Big
Stanley Kubrick's fan here; got all his flicks. ...I mean 'all of them', except his film essays from his school years.
* As for
'Barry Lyndon's "true" aspect ratio it's complicated:
http://www.highdefdigest.com/blog/barry-lyndon-aspect-ratio/
By the way, the DVD is @ 1.66.1 and the Blu is @ 1.78:1 screen aspect ratio.
...The film was shot in the 1.77:1 aspect ratio but was projected (cinema theaters) in the ...
Kubrick, Cameron (James), Spielberg, Lucas, Bay (Michael), Scott (Ridley), Scorsese, Malick (Terrence), Hitchcock, Gilliam (Terry), Friedkin (William), Kurosawa (Akira), Fellini (Federico), Leone (Sergio), Michelangelo (Antonioni), Tornatore (Giuseppe), Bush (George
), etc.; they are all in one aspect ratio or another when it comes to lenses and cameras.
And it varies too from one format to another; theatrical, VHS, Laser Disc, DVD, Blu-ray.
The thing is that all these master
"cineastes" don't have full control over all business distribution and art development.
If you want the real stuff simply get the original film pellicule (negatives) where it all started in the first place.
It's the same thing with audio (music); original reel-to-reel tapes. ...Mono, or stereo.
And good luck!