ChainsawAsh said:

Studios ignore that all the time. Do you know how many 1.66:1 or 1.85:1 movies are released in 1.78:1 (which is equal to 16:9)?

Besides, no "scope" film since 1970 has been 2.35:1 - all the Star Wars films are 2.39:1.

2.35:1 is the same as 2.39:1 and 2.40:1. 2.35:1 was changed because I think there was either a new measurement taken that discovered it was inaccurate, or some new standard came in. But they are all the same. 2.35 is still commonly used just because of its tradition. To be honest, I don't even know if anyone knows which of the three ratios is the right one, or if any of them are, but they are all interchangable for some reason.

As for determining ratios from home video, the amount of screen information is always cropped to one degree or another, so this has to be taken with a grain of salt, ultimately. Star Wars is anamorphic widescreen, so whatever version has the most amount of info is the most correct, so there is no negative cropping involved, unlike regualr or super 35mm spherical shoots.

Red5--those scans are fabulous. Where did they come from? Is there more? I remember someone here (Mielr?) tried to do some collectible-70mm scans but they sort of came out a little blurry because of the glass casings.